Pull-Ups vs. Underwear: Which Helps (and Which Slows Things Down)

Pull-ups are one of the most confusing parts of potty training, because they look like the obvious answer and often turn out to be part of the problem. They’re marketed as a training tool, they save you from cleaning up accidents, and they feel like a sensible halfway step. But for daytime training, they frequently slow things down, for a reason that becomes obvious once you see it. There are also moments when they genuinely help. The trick is knowing which is which.

Here’s how pull-ups and underwear each affect training, and how to use both well.

Why pull-ups can slow daytime training

The core issue is sensory. A pull-up is, functionally, a diaper that goes up and down like underwear. It absorbs, it keeps your child feeling dry, and it sits snugly in the same place a diaper always has. To a toddler, that combination sends one clear message: it’s okay to just go.

That undercuts the single most important thing daytime training teaches, which is the connection between the feeling of needing to go and the act of getting to the potty. When a pull-up whisks the wetness away, your child never feels the natural, slightly uncomfortable consequence of an accident, and never gets the feedback that drives awareness. They stay on autopilot. Many parents find that a child does fine in underwear but reliably “forgets” the moment a pull-up goes on, which is exactly this effect in action.

This is why a lot of potty-training approaches steer away from daytime pull-ups: they can quietly keep a child from learning the very thing you’re trying to teach.

Why underwear helps (with one catch)

Underwear, by contrast, lets your child feel an accident. That feedback, the cool, wet, uncomfortable sensation, is uncomfortable in exactly the useful way, nudging the child toward “I’d rather catch that next time.” It keeps awareness switched on.

There’s one catch, and it’s the reason the commando phase exists. Underwear introduced too early can itself feel like a diaper, because it’s snug fabric in the same spot, and a freshly trained child can revert to going in it without thinking. That’s why many parents have the best results going from bare-bottom training to a commando phase (clothes, no underwear) before introducing underwear, so the diaper-like cue doesn’t undo the new skill. Once the awareness is solid, underwear is a milestone that sticks rather than a trap.

When pull-ups genuinely help

Pull-ups aren’t the enemy. They’re a useful tool in the right places. They earn their keep:

• Overnight and at naps. Nighttime and nap dryness depend on physical maturity your child can’t control while asleep, so a pull-up here is practical and sensible, not a crutch. Soaked night pull-ups are normal for a long time.
• For long outings, travel, and the car. During the early days, a pull-up for a long drive or a situation with no bathroom access can be a reasonable bridge, as long as your child understands it’s for that specific situation, not a return to going freely.
• For poop, temporarily, if a child demands it. A child who will only poop in a pull-up is better off pooping comfortably in one for now than holding it in, which risks constipation. You shift that gradually rather than forcing the issue.

The principle: use pull-ups where the body genuinely isn’t in control (sleep) or where logistics demand it (no bathroom for hours), not as the default daytime garment during active training.

How to use each one well

During active daytime training

Lead with bare-bottom, then commando, then underwear, keeping daytime pull-ups out of the picture as much as you can. Let underwear accidents be the teaching tool they are, met with a calm, boring response.

For sleep

Use overnight and nap pull-ups without any sense of failure, and watch for consistently dry ones as the signal your child may be ready to try without.

For travel and outings

Use a pull-up as a clearly framed, temporary bridge for genuinely bathroom-free stretches, and return to underwear the rest of the time so the daytime learning continues.

What not to do

• Don’t rely on pull-ups as the default daytime garment during active training. They can stall the very awareness you’re building.
• Don’t jump straight from diapers to underwear without the commando step, or the underwear may feel like a diaper too.
• Don’t shame a child for an underwear accident. The accident is the lesson.
• Don’t pull a child out of overnight pull-ups before they’re waking dry. Night dryness is developmental, not trainable.

When to talk to your pediatrician

Pull-ups and underwear are practical choices, not medical ones, so this is mostly your call. Reach out to your pediatrician for the usual flags: a child who will only poop in a pull-up paired with signs of constipation, painful or hard poops, or a stalled daytime process despite clear readiness. Those point to causes a garment swap won’t fix.

Frequently asked questions

How Pottle helps

Pottle’s phase guide is built around the bare-bottom to commando to underwear progression precisely so you don’t get caught in the pull-up trap, telling you when daytime pull-ups help and when they hold things back, and when underwear will actually stick. It also treats naps and nights as their own stages where pull-ups are simply the right tool, so you use them with confidence instead of guilt.

Pull-ups are a tool, not a stage. Keep them for sleep and the genuinely bathroom-free stretches, let underwear do its teaching job during the day (after a commando step), and the confusion mostly disappears.