Why Does My Newborn’s Diaper Leak?

If you notice your newborn’s diaper constantly leaking, you might want to check if your little one’s diaper is securely worn, some edges may not be sealed into place or maybe it’s time for a size up? The brand of the diaper that your baby is using could affect it too.

It’s the kind of mess we don’t want to deal with, ever, but why does your baby’s diaper leak? At the most inconvenient hour most of the time, like in the middle of the night.

There could be multiple possible reasons for a diaper leak. If the diaper leaks through the night, make sure that you are using an overnight type of diaper so it could keep up for a longer period, but if it happens within the day, you can check for other possible reasons below.

Possible reasons why your baby’s diaper leak

Mom is inspecting her newborn's diaper, as it has been leaking constantly lately.

1. Diaper size

Make sure that your baby is using the correct diaper size because both too small or too large could cause a diaper leak.

A diaper that’s too small will not be enough for the amount of pee and poop your baby can produce. A diaper that’s too large would not be securely fitted to avoid leakage, and the poor fitting would most probably do the same thing.

2. Change frequency

You don’t need to change their diaper every hour, but you also don’t want to wait for their diaper to be extremely full before you change them into a new one. It usually needs to be changed within 3-4 hours.

Sometimes even sooner, if you have a heavy wetter baby, make sure that you check their diaper at least every hour (during the day) and make sure that they sleep on a clean nappy before they head to bed so that it would last overnight.

3. Proper fit on your baby

Sometimes changing our babies’ diapers is not as easy as it sounds, they will wiggle out of it while you are putting it on, or they will try to roll over and crawl. The point is, sometimes we know how to wear it to them properly, but they don’t always cooperate with that mission.

If you have a son, it’s helpful to check if their penis is positioned downwards inside their nappy.

4. Diaper brand

Before having a child of my own, I used to think that the diaper brand doesn’t really matter that much because its only job is to absorb pee and catch poop, and I thought, all diapers can do that, regardless of brand.

Guess what, it does matter, a lot. For example, one brand could be good at absorbing, but your baby’s skin doesn’t sit well with it, while the other brand could be extra soft for the baby’s skin but has a poor fit for your baby.

How to avoid diaper leaks?

Mom is changing her newborn baby's diaper, which she recently changed in size when she noticed diaper leaks often.

1. Correct size

Too big, too small, poor fitting, all could lead to diaper leaking. Usually, you can base the size of their nappy using their weight which could lead to the amount of pee and poop that they will produce within the day.

Make sure that your baby is using the diaper size that works for them at their age.

2. Securely worn

Make sure that all openings are sealed by checking if they sit perfectly to your baby’s skin, not too tight, and not too loose either.

The pads should be aligned and are on the center for you to make sure that they would catch your baby’s pee and poop.

3. Correct diaper brand

Getting recommendations are great, but you have to remember that your baby is different from another baby. Even if they do have the same age, they have different skin and activities.

Some brands might be exceptional with absorption but are not very comfortable for your baby’s skin type. The last thing that we want is for our baby to have diaper rashes. It could lead to more frustration for your baby.

Find the diaper brand that works for your baby perfectly for both use and comfort.

4. Change/check often

Most babies tend to pee just shortly after waking up and eating. So you might want to check on their diaper around that time.

Don’t wait for your baby to wet the entire diaper pad before changing them into a fresh one, Keep a close eye on their activities, if your baby has been drinking liquids frequently, the chances of them peeing often is high.

The same goes with their poop. If your baby’s milk intake is regular, they should be able to flush that in a couple of hours once or twice within the day.

5. Diaper booster pads

If all else fails, you might want to consider getting a little bit of help from a diaper booster pad.

This way, your baby is like using the amount of 2 diapers while just wearing one. You can just use a booster at the usual time when your baby experiences diaper leak problems.


What is the best diaper for newborns?

This will depend on your baby, newborns’ skin is usually extra sensitive, and you need to choose a diaper brand that will be breathable and comfortable enough for your baby.

It’s always important to note that one brand might work for one baby but not for the other because they are two different babies.

Can babies wear overnight diapers during the day?

Overnight diapers can normally be worn during the day without issue, but they are typically more expensive than regular diapers.

Since they also tend to be bulkier, active babies that wear pants and shorts might find them uncomfortable or hard to manage.


We’ve all been through this leaky problem at some point, and it’s frustrating not to control the situation, but once you figure out what’s causing your baby’s diaper leaks, it’ll get better from there.

I hope this article helped you in any way. Please feel free to share your personal experiences in the comment section below, we would love to hear from you. Questions are also very much welcome here. Always stay healthy and happy!

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Currently located in the Philippines. Mother of an active curly boy whose energy rarely runs out. When I am not busy keeping up with my son, you'll find me reading, cooking, or most of the time keeping the house clean.

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