I'm sure Aldi nappies don't fit every baby body type... but if anything they seem to be the highest fitting of all the sposies I've tried... plus never had a leak... but like I said: my babies are skinny specimens LOL who don't have huge quantities of liquid compared to other babies (mine are more grazers... could never fit more than 180 ml at a time of expressed milk... bit like me: small stomach capacity)... this may account for them (Aldi) never leaking.