But I have another question first..... DD is about 17lbs and fits the mediums nicely, but she is quite long and thin so they are very low. When I fasten them they are on the tightest poppers without overlapping. Now, I want to get a full set but as they are sized I don't really want to get mediums now and then have to spend another fortune getting larges in a couple of months. Soooooo....... can I get away with larges now do you think? Are they going to leak if they're too big or will they just come up higher on her body? I am not going to use them over night as dd hates anything except disposables over night and I figured that if I only use them at night (the eco ones obviously) then I'm still going to go to heaven.