Hello! My DD is 5 months and weighs 15lbs. I’ve had her in size 4 nappies overnight but these keep leaking. I have bought some 4+ to try as i thought these are just the same as 4s but more absorbent but I’ve just noticed the minimum weight is 20lbs. They literally look the same size to me but I don’t know if they will be too big somehow and then leak because of that?? Trying to decide which to put her in for bed tonight!!