Toilet Training

Abstract

Toilet training, which the Medical Subject Headings vocabulary classifies under child rearing, is the process of teaching a child to control bladder and bowel elimination and to use the toilet independently. Psychology approaches it less as folklore than as a trainable behavior with two rival traditions: the child-oriented approach, which waits for developmental readiness, and the operant or intensive approach, which structures training through reinforcement. This article explains what toilet training is and how it is classified, how readiness signs define the proper moment to begin, how the child-oriented and behavior-analytic methods differ, and what the evidence says about the age of initiation and training duration. It reviews the readiness-signs literature, the secular trend toward later training, and current directions in the behavior-analytic appraisal of training procedures.

Keywords: toilet training, readiness signs, child-oriented approach, operant conditioning, continence

Toilet training is the point at which a culture's expectations about cleanliness meet a child's maturing physiology, and psychology studies it because the handover of elimination from reflex to voluntary control is both a developmental milestone and a teachable skill. As a specific socialization task within the broader work of child rearing, it has attracted two distinct research traditions: a pediatric, child-oriented tradition that treats readiness as something to wait for (Brazelton, 1962), and a behavior-analytic tradition that treats continence as something to train through structured reinforcement (Foxx & Azrin, 1973). The tension between waiting and training organizes most of what is known.

What Toilet Training Is

Toilet training is the ongoing process by which a child learns to recognize the bodily signals of a full bladder or rectum, to inhibit elimination until reaching a toilet, and to carry out the sequence of toileting independently. In the Medical Subject Headings vocabulary it is classified under child rearing, the broad set of practices through which caregivers raise children, which places it among socialization tasks rather than among medical disorders. This classification is an indexing convenience rather than a theoretical claim, but it captures something real: toilet training is something caregivers do with a child, and because it is a behavior it can be described, measured, and related to its outcomes.

The developing child brings maturing equipment to the task. Early elimination is largely reflexive; sphincter control, the voluntary regulation of the muscles that open and close the bladder outlet and the anus, emerges only as the nervous system matures, and continence, the reliable achievement of dry and clean intervals, follows. Erikson placed this handover at the center of his second psychosocial stage, autonomy versus shame and doubt, in which a toddler's growing command of the body becomes a template for a wider sense of self-control, and premature or shaming pressure can leave doubt in its place (Erikson, 1963). The demonstration below lets the reader assemble readiness signs across the three domains clinicians look at and see when a child crosses a conventional threshold.

Check the readiness signs a child shows

Reviews of readiness group the observable signs into three domains and treat readiness as a cluster rather than any single marker. Toggle the signs a child shows; the verdict tracks how many domains are represented, not merely the count.

Table 1 groups the readiness signs that the pediatric literature treats as indicators that training can begin, organized by the domain each belongs to.

Readiness and When to Begin

The child-oriented approach, introduced by Brazelton, holds that training should begin only when a child shows readiness and should proceed at the child's own pace, using gradual, pressure-free steps rather than a fixed schedule (Brazelton, 1962). Its premise is that the physiological and psychological prerequisites of continence cannot be hurried, and that forcing the issue invites resistance. Readiness is not a single switch but a cluster of signs, and a systematic review of the literature concluded that no one sign is decisive; the proper moment is better defined by the convergence of several physiological, cognitive, and behavioral indicators (Kaerts, Van Hal, Vermandel, & Wyndaele, 2012). Later observational work tracked which development signs appear at which stages of training and argued that attending to them helps avoid breakdowns such as stool toileting refusal, the pattern in which a child will urinate but withholds bowel movements (Wyndaele, Kaerts, Wyndaele, & Vermandel, 2020).

The skills themselves arrive in a predictable order. A descriptive study of normal children found that toilet-training milestones are acquired sequentially rather than all at once, with girls generally completing the sequence earlier than boys (Schum, Kolb, McAuliffe, Simms, Underhill, & Lewis, 2002). That ordering is one reason age alone is a poor guide: two children of the same age can sit at very different points along the sequence. Partly as a result, the age at which families begin has drifted upward; a study of factors associated with later training documented this secular trend and tied it to the spread of the readiness-based philosophy and of disposable diapers (Blum, Taubman, & Nemeth, 2004).

Methods: Child-Oriented and Intensive

The operant alternative treats continence as a behavior to be built directly. Foxx and Azrin's intensive 'dry pants' method compressed training into a focused period using increased fluids to create frequent practice opportunities, scheduled sits, positive reinforcement for success, and immediate correction of accidents, producing rapid results in both typically developing children and institutionalized populations (Foxx & Azrin, 1973). Where the child-oriented approach waits, the intensive approach engineers; both now inform mainstream practice, and a review of methods in healthy children concluded that structured approaches can be effective while cautioning that evidence quality is uneven (Vermandel, Van Kampen, Van Gorp, & Wyndaele, 2008).

Popular training packages bundle many elements together, which raises the question of which ones actually matter. A component analysis isolated the ingredients of commonly recommended procedures and found that some, such as dense reinforcement and scheduled sits, carried most of the effect, while others added little (Greer, Neidert, & Dozier, 2016). A systematic review comparing methods in children with normal neuropsychomotor development reached a complementary conclusion: no single method is clearly superior for all children, and the choice depends on the child, the family, and the setting (de Carvalho Mrad et al., 2021). The demonstration below contrasts the two traditions feature by feature so that their trade-offs are explicit.

Compare the two training traditions

The child-oriented and intensive-operant approaches answer different questions, one about when a child can be trained and one about how training is delivered. Select a feature to see how each tradition handles it.

The Timing Trade-off

One of the most robust empirical findings concerns the relationship between when training starts and how long it takes. A prospective study found that children who began earlier took more total time to finish, yet completed training at a younger absolute age, so earlier starting buys an earlier finish at the cost of a longer process (Blum, Taubman, & Nemeth, 2003). The finding reframes the common question 'when should training start?' as a trade-off rather than a search for a single optimal age, and it explains why confident claims in either direction are usually overstated. Stool toileting refusal is one way the process can stall; a prospective study of children who refused to pass stool in the toilet found that the pattern is common, usually transient, and associated with later completion but not with lasting harm (Taubman, 1997).

Worked Example

The child-oriented rationale can be made precise with a simple model of readiness. Treat overall readiness as the joint presence of several independent signs, each present with probability p, so that the probability of a child showing all n signs is the product p raised to the power n. Suppose a clinician looks for four readiness signs, so n = 4. At an earlier age, each sign is present with probability p = 0.6; the probability that all four are present is then 0.6 to the fourth power, 0.6 x 0.6 x 0.6 x 0.6 = 0.1296, about 13 percent. Now suppose the family waits several months, by which time each sign is present with probability p = 0.9; the joint readiness becomes 0.9 to the fourth power, 0.9 x 0.9 x 0.9 x 0.9 = 0.6561, about 66 percent. Waiting has raised the chance that the child is fully ready from roughly 13 percent to roughly 66 percent, a fivefold increase, even though the per-sign probability rose only from 0.6 to 0.9. The multiplication captures why the child-oriented approach counsels patience: because readiness requires several signs at once, modest gains in each sign compound into a large gain in overall readiness (Brazelton, 1962; Kaerts et al., 2012). The demonstration below uses exactly this product model, so adjusting the per-sign probability or the number of signs rescales the joint readiness and shows the compounding directly.

Readiness as a product of signs

Treat overall readiness as the joint presence of n independent signs, each present with probability p, so joint readiness is p raised to the power n. Because several signs must hold at once, a modest rise in each sign compounds into a large rise overall.

At p = 0.60 and n = 4, joint readiness is 0.1296 (about 13 percent); raising each sign to p = 0.90 lifts it to 0.6561 (about 66 percent), the fivefold gain described in the worked example.

Key Researchers

Nathan H. Azrin

(1930-2013). Behavior analyst at Southern Illinois University and later Nova Southeastern University; with Richard Foxx he developed the intensive 'dry pants' rapid toilet-training method grounded in operant conditioning. Wikipedia

Nathan J. Blum

(living). Developmental-behavioral pediatrician and division chief at the Children's Hospital of Philadelphia; his prospective cohorts established the trade-off between initiation age and training duration and documented the trend toward later training. CHOP

T. Berry Brazelton

(1918-2018). Pediatrician and Clinical Professor Emeritus at Harvard Medical School; he introduced the child-oriented, readiness-based approach that anchors modern pediatric guidance. Wikipedia

Erik H. Erikson

(1902-1994). Developmental psychologist at Harvard University; he placed sphincter control within the psychosocial stage of autonomy versus shame and doubt, linking toileting to a toddler's emerging self-control. Wikipedia

Richard M. Foxx

(living). Professor Emeritus of psychology at Penn State Harrisburg; with Nathan Azrin he devised the rapid intensive training protocol and its use with developmental disabilities. Penn State

Sigmund Freud

(1856-1939). Founder of psychoanalysis; he originated the 'anal stage' of psychosexual development, the historical source of the idea that toileting carries psychological significance, a view the later developmental and empirical literature superseded. Wikipedia

Timothy R. Vollmer

(living). Professor of psychology and director of the Behavior Analysis Research Clinic at the University of Florida; he has led a contemporary critical appraisal of the behavior-analytic toilet-training literature and its open questions. ORCID

Jean-Jacques Wyndaele

(living). Emeritus professor of urology at the University of Antwerp; his reviews defined the readiness and development signs that mark the proper moment to begin training. ORCID

Discussion

Toilet training is a compact case study in how psychology adjudicates between competing accounts of the same behavior. The child-oriented tradition and the operant tradition are not simply rivals to be scored against each other; they answer different questions. The readiness literature asks when a child's physiology and cognition permit training to succeed without struggle (Brazelton, 1962; Kaerts et al., 2012), while the behavior-analytic literature asks how, given that a child can be trained, the training is most efficiently delivered (Foxx & Azrin, 1973; Greer et al., 2016). The two converge in practice: contemporary guidance begins when readiness signs are present and then applies structured reinforcement, taking the empirical trade-off between initiation age and duration as a planning fact rather than a prescription (Blum et al., 2003; Blum et al., 2004).

The field also illustrates how an older theoretical frame can be retained as vocabulary while its causal claims are abandoned. Freud's anal stage gave the culture the intuition that toileting is psychologically freighted, and Erikson's reworking preserved a defensible kernel, that a toddler's command of the body feeds a wider sense of autonomy, without the drive theory (Erikson, 1963). What survives empirical scrutiny is modest and useful: readiness is real and multidimensional, methods differ mainly in their active ingredients, and most stalls, including stool toileting refusal, are transient (Taubman, 1997; Wyndaele et al., 2020).

Current Directions

The most active work is a critical reappraisal of the behavior-analytic evidence base. A recent reflection argued that the influential rapid-training studies, though foundational, leave central questions underdetermined, including how to define mastery, how to measure maintenance and generalization, and how to train children for whom the standard packages fail (Bacotti, Perez, & Vollmer, 2023). A parallel strand is methodological consolidation: the systematic review by de Carvalho Mrad and colleagues found that the comparative literature remains heterogeneous and under-powered, so that strong claims of one method's superiority outrun the data (de Carvalho Mrad et al., 2021). A third strand continues to refine the readiness construct, using longitudinal observation of which signs appear in which order to sharpen the definition of the proper moment to begin and to predict and forestall breakdowns (Wyndaele et al., 2020). Across these strands the research program is to move from tradition and testimonial toward measurable procedures whose effects can be estimated and compared.

Common Misconceptions

There is a single right age to start.

Readiness is a cluster of physiological, cognitive, and behavioral signs, not a birthday; age alone is a poor guide because children of the same age sit at different points along the skill sequence (Kaerts et al., 2012; Schum et al., 2002).

Starting earlier always finishes earlier.

Earlier initiation is associated with a longer training interval even though it yields an earlier completion age, so there is a genuine trade-off rather than a free gain (Blum et al., 2003).

Refusing to pass stool in the toilet signals a serious problem.

Stool toileting refusal is common and usually transient, associated with later completion but not with lasting harm (Taubman, 1997).

Glossary

Anal stage.

In Freudian psychosexual theory, the developmental period in which gratification centers on elimination and control of the bowels; the historical source of the idea that toileting is psychologically significant.

Autonomy versus shame and doubt.

Erikson's second psychosocial stage, in which a toddler's growing command of the body, including elimination, becomes a template for a wider sense of self-control.

Bladder control.

The voluntary regulation of urination, including the ability to store urine and to release it deliberately at a toilet.

Bowel control.

The voluntary regulation of defecation, typically the last element of continence to be fully achieved.

Child-oriented approach.

Brazelton's method of beginning only when a child shows readiness and proceeding at the child's own pace in gradual, pressure-free steps.

Continence.

The reliable achievement of dry and clean intervals through voluntary control of elimination.

Elimination.

The bodily expulsion of urine and feces; the function that toilet training brings under voluntary, socially appropriate control.

Intensive training.

The Foxx and Azrin 'dry pants' method, which compresses training into a focused period using increased fluids, scheduled sits, reinforcement, and correction of accidents.

Operant conditioning.

Learning in which behavior is shaped by its consequences; the mechanism the behavior-analytic tradition applies to build continence through reinforcement.

Readiness signs.

The physiological, cognitive, and behavioral indicators whose convergence marks the proper moment to begin training.

Reinforcement.

A consequence that increases the future likelihood of the behavior it follows, such as praise for a successful toilet use.

Scheduled sits.

Regular prompted visits to the toilet at set intervals, a component of intensive methods that creates frequent opportunities for reinforced success.

Secular trend.

The documented drift toward beginning toilet training at older ages over recent decades, attributed to readiness-based philosophy and disposable diapers.

Sphincter control.

The voluntary regulation of the muscles that open and close the bladder outlet and the anus, a physiological prerequisite of continence.

Stool toileting refusal.

A common, usually transient pattern in which a child will urinate in the toilet but withholds bowel movements, often passing stool only in a diaper.

Frequently Asked Questions

What is toilet training?

It is the process of teaching a child to recognize the need to eliminate, to control the bladder and bowel until reaching a toilet, and to carry out toileting independently; MeSH classifies it as a form of child rearing (Brazelton, 1962).

When should toilet training begin?

There is no single right age; the proper moment is defined by the convergence of several physiological, cognitive, and behavioral readiness signs rather than by age alone (Kaerts et al., 2012).

What is the difference between the child-oriented and intensive approaches?

The child-oriented approach waits for readiness and proceeds at the child's pace, while the intensive operant approach structures a focused period of practice, reinforcement, and correction to build continence quickly (Brazelton, 1962; Foxx & Azrin, 1973).

Does starting earlier mean finishing sooner?

Not straightforwardly; earlier initiation is associated with a longer training interval even though it produces an earlier completion age, so the decision is a trade-off (Blum et al., 2003).

Why has the age of toilet training risen over time?

A secular trend toward later training has been documented and attributed to the spread of the readiness-based philosophy and of disposable diapers (Blum et al., 2004).

Is it a problem if a child will urinate but not pass stool in the toilet?

Stool toileting refusal is common and usually transient, associated with later completion but not with lasting harm (Taubman, 1997).

Which parts of a training method actually matter?

A component analysis found that dense reinforcement and scheduled sits carried most of the effect, while other bundled elements added little (Greer et al., 2016).

Is one method clearly best?

No; a systematic review of methods in typically developing children found the comparative evidence heterogeneous, with no single method superior for all children (de Carvalho Mrad et al., 2021).

References