Clothing is among the top baby registry items. Most newborn sizes top out around eight pounds, so if you have a bigger baby, they may need 0-3 months sizes from the start. (And if they’re on the smaller side, odds are they’ll only fit into newborn sizes for a few weeks anyway.) Pick a few newborn items and then focus on 0-3 months since those clothes will fit babies up to around 12 or 13 pounds.