Why Does My Baby's Diaper Keep Leaking? 7 Common Causes (and Easy Fixes)

You've just put on a fresh diaper, dressed your baby in a clean outfit, packed the changing bag and you're finally ready to leave the house. Then you pick your baby up... and discover the diaper has leaked. Again.

It's frustrating, especially when you thought a fresh diaper would buy you a few hours.

The good news is that most leaks aren't caused by a “bad” diaper. In fact, changing brands is usually the last thing we'd recommend. More often than not, it's something simple that's easy to fix.

Here are the seven most common reasons diapers leak, and what you can do about them.

1. Your Baby Has Outgrown Their Diaper

This is by far the most common reason.

Many parents wait until their baby reaches the maximum weight printed on the pack before moving up a size.

In reality, your baby often outgrows the fit before they outgrow the weight range.

Signs it might be time to size up include:

• Frequent leaks
• Red marks around the legs or waist
• Tabs that barely reach across the front
• Blowouts becoming more common
• The diaper looking unusually full after only a short time

If you're seeing several of these signs, try the next size before changing brands.

Quite often, that's all it takes.

2. The Leg Ruffles Are Tucked In

This one catches a surprising number of parents out.

Most disposable diapers have two ruffles around each leg.

The inner ruffle should sit comfortably against your baby's leg.

The outer ruffle should be pulled out once you've fastened the diaper.

If the outer ruffle is tucked inside, liquid can escape much more easily around the legs.

It takes two seconds to check, but it can make a surprising difference.

3. The Diaper Isn't Fastened Properly

A diaper that's too loose leaves gaps around the waist and legs.

Too tight, and it may not sit properly once your baby starts moving around.

Try fastening both tabs at the same height and make sure the waistband sits snugly around your baby's waist without leaving gaps.

A good rule of thumb is that you should be able to fit two fingers comfortably inside the waistband.

4. Your Baby Sleeps Longer Than the Diaper Can Handle

Nighttime leaks are a different problem.

During the day, most babies are changed every few hours.

At night, the same diaper might need to last 10 or even 12 hours.

If leaks only happen overnight, try one of these first:

• Move up one size for bedtime.
• Try an overnight diaper.
• Change your baby just before you go to bed if they're already asleep.

Often, you don't need a different brand.

You simply need more absorbency overnight.

5. The Diaper Isn't Right for Your Baby

Not every diaper is designed with the same priorities.

Some focus on softness.

Some focus on value.

Others are designed to absorb as much liquid as possible.

If you've already checked the size and fit but leaks keep happening, it might simply be time to try another diaper.

That's especially true if your baby regularly sleeps through the night.

If you're trying a different line specifically for absorbency or price, we've compared Pampers' most popular lines head-to-head, including what each actually costs per diaper.

6. Your Baby Is Constantly On the Move

Once babies start rolling, crawling and walking, diapers have a much harder job to do.

A diaper that worked perfectly at three months may start shifting once your baby is constantly climbing, twisting and exploring.

If this sounds familiar, consider:

• Trying a more flexible diaper.
• Switching to diaper pants if your baby is already walking.
• Moving up a size if the current diaper feels snug.

Sometimes the diaper hasn't changed.

Your baby has.

7. It Could Be the Way Your Baby Is Wetting the Diaper

This is something many first-time parents don't hear about.

With baby boys, positioning matters more than people expect. Make sure everything's pointed downwards before you fasten the diaper. If it's aimed up or to the side, urine can miss the absorbent core entirely and leak out the front or waistband.

With girls, leaks are more often related to fit or absorbency than positioning.

It's a tiny adjustment, but one that solves more leaks than many parents of baby boys expect.

Our Take

If your baby's diaper suddenly starts leaking, don't rush out and buy a different brand.

Start with the basics.

Try the next size up.

Check that the leg ruffles are sitting properly.

Make sure the diaper fits snugly without being too tight.

Think about whether the leaks only happen overnight.

Those four steps solve the vast majority of leak problems.

If you're still dealing with leaks after that, it may simply be time to try a different diaper that's better suited to your baby's shape, sleeping habits or activity level.

Frequently Asked Questions

Should I size up if my baby's diaper keeps leaking?

Often, yes. If you're seeing frequent leaks, red marks around the legs, or the tabs are becoming difficult to fasten, moving up a size is usually the first thing to try.

Can a diaper be too big?

Yes. A diaper that's too large can leave gaps around the legs and waist, allowing leaks to escape just as easily as one that's too small.

Why does my baby's diaper only leak at night?

Nighttime diapers need to absorb much more liquid than daytime diapers. Moving up one size for bedtime or switching to an overnight diaper often solves the problem.

Should I switch brands if my baby's diaper leaks?

Not straight away. First check the size, fit and leg ruffles. If you're still having problems after that, trying a different brand can make a real difference.

Before You Buy More Diapers

Sometimes the solution is finding a diaper that fits your baby better.

And if you do decide to switch diapers, there's no reason to pay more than you have to.

Before you stock up, compare today's price per diaper across the UAE retailers we track. The cheapest pack isn't always at the store you'd expect, and prices can vary more than most parents realise.