Even though you might not want them to, babies grow fast, which means they’ll grow out of their nappies fast, too.
If your baby’s nappy is leaking or doesn’t last as long between changes, it’s probably too small; this is because a larger nappy will offer an increased absorbance.
You might notice a rash on their bottom, or around their tummy and thighs - this might be due to them sitting in a saturated nappy, or that the waistband is too tight and is causing irritation.