Potty training: when to start and which method works best

When to start: age range and readiness signs

Most children are developmentally ready somewhere between 18 months and 3 years, but age alone is a poor guide. A 2-year-old who is not ready will struggle, while a mature 18-month-old may sail through. Watch for these readiness signals instead:

• Staying dry for at least 2 hours — this shows the bladder can hold urine long enough to make it to the toilet in time.
• Interest in the toilet — following you to the bathroom, asking questions, or showing curiosity about what happens there.
• Awareness of bodily functions — announcing before or during a bowel movement, or touching their nappy when it is wet.
• Pulling pants up and down independently — a practical motor skill that makes the whole process faster and less frustrating.
• Following simple instructions — being able to understand and act on "go sit on the potty" without it turning into a negotiation.

If three or more of these are present, you are in good territory to begin. If fewer than two apply, waiting another month or two is often more efficient than pushing ahead.

Three main methods

Child-led (Brazelton method)

Developed by paediatrician T. Berry Brazelton in the 1960s and still widely recommended today, this approach places the child firmly in charge. You introduce the potty, explain its purpose, and then wait for the child to show consistent interest before expecting results. There is no pressure, no schedule, and no punishment for accidents. The idea is that when children are genuinely ready, training happens quickly and with minimal conflict. The downside is that some children, if not gently prompted, may stay in nappies longer than necessary.

3-day intensive (Oh Crap! method)

Popularised by Jamie Glowacki's book Oh Crap! Potty Training, this method condenses the learning into a long weekend. On day one the child is naked from the waist down and you watch closely for cues, guiding them to the potty at the first sign. By day two you add loose trousers, no underwear. By day three you venture outside. The method works well for children who are ready but whose parents are struggling to find a natural entry point. It requires a parent or carer to be fully available for those days, which is worth planning for.

Gradual transition

A slower, lower-pressure approach where training happens over several weeks. You might start with a single daily potty sit after breakfast, add more trips as confidence grows, and switch to underwear only once accidents are rare. This suits families who cannot dedicate a concentrated block of time, or children who respond poorly to sudden change. Progress is slower but steady, and children rarely feel overwhelmed.

Pull-ups vs underwear: the debate

Pull-ups are comfortable, convenient for outings, and reduce laundry — but many parents and experts argue they send a mixed message. A child in pull-ups cannot feel wetness the same way they do in cloth underwear, which removes one of the key feedback loops that reinforces learning.

A practical middle ground used by many families: underwear during waking hours at home, pull-ups for naps, night-time, and long car journeys. Once accidents are consistently rare during the day, pull-ups can be phased out at night too — although night-time dryness follows its own timeline (see below).

Night-time dryness: a separate milestone

It is worth knowing that staying dry through the night is physiologically different from daytime control, and typically lags behind by 6 to 12 months. Night dryness depends on the brain producing enough antidiuretic hormone (ADH) to slow urine production during sleep — a process that cannot be trained, only waited for.

Signs that night dryness is approaching: the pull-up is consistently dry in the morning, your child wakes up to use the bathroom, or they mention that they need to go before bed. Until those signs appear, a pull-up or waterproof mattress protector at night is sensible, not a failure.

Handling regression

Regression — when a child who was reliably toilet-trained starts having frequent accidents again — is one of the most common and least discussed parts of potty training. Common triggers include:

• A new sibling arriving (attention shifts, routines change).
• Starting nursery or changing daycare.
• Moving house or a family disruption.
• Illness, particularly anything involving stomach upset.
• A developmental leap that temporarily absorbs attention.

The best response is calm and low-key. Avoid drawing attention to accidents or expressing frustration — both can create anxiety that deepens the regression. Return to basics: regular prompted toilet trips, a small reward for successes, and reassurance that accidents are fine. Most regressions resolve within two to four weeks without special intervention.

Using Bebblo to spot potty-training readiness

One of the lesser-known uses of a baby tracker is spotting the dry periods that signal bladder control is maturing. When you log diaper changes in Bebblo, you can see at a glance how long gaps between wet nappies are becoming. A consistent gap of two or more hours during the day is one of the clearest readiness indicators — and it is easy to miss without a log.

Bebblo stores the history locally on your phone, so you can scroll back over days or weeks and show the pattern to a health visitor or paediatrician at your next check-up.

This article is for general guidance and does not replace advice from your doctor or health visitor. If your child is past 3.5 years and showing no interest in the toilet, or has significant distress around toileting, speak to your paediatrician.

Frequently asked questions

When should I start potty training?

Most children are ready between 18 months and 3 years. The key is readiness, not age: look for staying dry for 2+ hours, showing interest in the toilet, and being able to pull pants up and down independently.

What is the 3-day potty training method?

The 3-day (or "Oh Crap!") method involves a concentrated weekend where the child stays home pants-free, and caregivers watch closely for cues and prompt toilet trips. It works best when the child already shows clear readiness signs.

Should I use pull-ups or underwear during potty training?

Many experts favour underwear during the day because the sensation of wetness reinforces learning faster. Pull-ups can be useful at night or during long outings, but using them during daytime training may slow the process.

My child was potty trained but started having accidents again. What should I do?

Regression is common after changes like a new sibling, starting daycare, or illness. Stay calm, avoid punishment, and go back to basics with gentle reminders and positive reinforcement. Most regressions resolve within a few weeks.

Track diapers and spot dry periods with Bebblo

Bebblo logs diaper changes with a single tap and shows you gaps between changes — helping you spot when bladder control is maturing and your child may be ready to start. Free, no mandatory account.