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Toilet training is the process of training someone, particularly a young child or infant, to use the toilet for urination and defecation. Attitudes toward training in recent history have fluctuated substantially, and may vary across cultures and according to demographics. Many of the contemporary approaches to toilet training favor a behaviouralism- and cognitive psychology-based approach.

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The anal stage is the second stage in Sigmund Freud's theory of psychosexual development, taking place approximately between the ages 18 months and three years. According to Freud, the anus is the primary erogenous zone and pleasure is derived from controlling bladder and bowel movement. The major conflict issue during this stage is toilet training. A fixation at this stage can result in a personality that is too rigid or one that is too disordered.

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GoodNites are a form of pull-on disposable diaper designed for managing nocturnal enuresis. GoodNites are produced by Kimberly-Clark.

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Nocturnal enuresis, also called bedwetting, is involuntary urination while asleep after the age at which bladder control usually begins. Bedwetting in children and adults can result in emotional stress. Complications can include urinary tract infections.

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Open-crotch pants, also known as open-crotch trousers or split pants, are worn by toddlers throughout mainland China. Often made of thick fabric, they are designed with either an unsewn seam over the buttocks and crotch or a hole over the central buttocks. Both allow children to urinate and defecate without the pants being lowered. The child simply squats, or is held by the parent, eliminating the need for diapers. The sight of the partially exposed buttocks of kaidangku-clad children in public places frequently astonishes foreign visitors, who often photograph them; they have been described as being "as much a sign of China as Chairman Mao's portrait looming over Tiananmen Square."

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A potty chair, or simply potty, is a proportionately small chair or enclosure with an opening for seating very young children to "go potty." It is a variant of the close stool which was used by adults before the widespread adoption of water flushed toilets. There are a variety of designs, some placed directly over the toilet called "Toilet Training Seats" so the egested fecal material drops directly into the toilet bowl thereby eliminating manual removal and disposal of the said waste from a receptacle beneath the hole which is often a bag or receptacle similar to a chamber pot. Potty chairs are used during potty training, a.k.a. toilet training.

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UnderJams are a pull-on style diaper made by Pampers for managing bedwetting. They are similar to GoodNites. "UnderJams" claim to be softer and quieter than GoodNites, and even though the package states that they will only fit children up to 85 lbs. Also, because of their low waist, they are hardly visible under pajamas. They were discontinued in 2020 in favor of the new P&G product, Ninjamas.