The newborn nappies are intended for those lower wetting but higher frequency changes that you will encounter in the first few weeks, when you can be changing up to 10 nappies a day. They can be used with a very small or premature baby and will last basically until your baby has grown into the one-size Pop-in nappy… this could be anything from 4 weeks to 4 months!
The Pop-in nappies are intended for use for up to around 2 - 2 ½ years when most children are potty trained, but of course washing conditions and detergent use differ from family to family so we cannot guarantee every nappy will last exactly 2 ½ years.
Every baby is different and will potty train at different ages, but they’re called birth to potty nappies to indicate that once your baby is big enough to fit into them, you don’t need to change sizes and buy new nappies as your baby grows.
You’ll just continue to use the same nappy, changing the size setting using the poppers on the front.
Please note that all Pop-in nappies are intended for use for one baby, not more than one.