Aw don't worry! Adam stayed in 2's the longest. Actually, I moved him into Swaddlers 2-3 prematurely because his body was shaped to where he needed it. But, I had 2 packs of 2 left when he bumped up and I just took them to the store (Babies R Us or Target, I don't remember which) and exchanged for a size up since they were sealed! Babies R Us is REALLY good about that!!