Quick answer

Most cloth diaper leaks come from fit issues, compression, or a worn-out absorbent layer. Check the leg gussets, adjust the rise snaps, and make sure you're using enough absorbency for your baby's output. If you still see leaks, it might be time to replace the inserts or try a different style.

Common Leak Causes and Fixes

One of the most frequent causes of leaks is a poor fit around the legs. The leg gussets should sit snugly against the skin without gaps. If you can fit more than one finger between the diaper and your baby's leg, tighten the rise or leg snaps. Another common culprit is compression leaks, which happen when tight pants or car seat straps press moisture out of the diaper. Try loosening the outer layer or switching to a more absorbent insert.

If your diaper is leaking through the fabric itself, the waterproof layer may be failing. PUL (polyester laminate) can degrade over time from heat, bleach, or simply age. Check for delamination—bubbling or peeling inside the cover. If you see it, the diaper or cover needs replacing. For nighttime leaks, consider adding a hemp or bamboo booster for extra absorbency.

When to Replace or Upgrade

Sometimes leaks persist no matter what you adjust. If your diaper is more than two years old or has been through heavy use, the elastics may be stretched out. You can replace the elastics if you sew, or retire the diaper. For ongoing issues with absorbency, a pail liner can help contain messes during storage. The ABC-Pail Liner from Squishy Lil' Campers has an elastic top that fits most diaper pails and trash cans up to 40 quarts, with sewn-in closure snaps to keep odors in. It's a simple way to manage leaks between washes.

Leak Diagnosis Guide

  • Leak at the legs: Check for gaps between the diaper and your baby's thighs. Tighten leg or rise snaps, or adjust the fit. If tightening doesn't help, the elastics may be worn out.
  • Leak through the fabric: Inspect the PUL layer for bubbling or peeling. This is delamination and means the waterproof layer has failed. Replace the diaper or cover. Do not use bleach or high heat in the future.
  • Leak only after sitting or in a car seat: Compression is squeezing liquid out. Add a hemp or bamboo booster, or loosen tight outer clothing. If leaks persist, try a different insert material or increase absorbency.

Product That Helps

  • ABC-Pail Liner: Our pail liners have elastic tops that provide a snug fit on most diaper pails or trash cans up to 40 quarts. Sewn-in closure snaps on both sides keep odors in or for hanging purposes. Made with all waterproof materials-PUL (100% polyester) prevents leaking to help keep moisture out of your diaper pail. If leaks are causing extra laundry or odor issues, a waterproof pail liner keeps everything contained until wash day, making cleanup simpler and reducing smells.