0-3 month clothing

So my older sister gave me bunch of baby clothes since her youngest will be 10 months when my baby is born. How many pairs of pants does a baby need in size 0-3 months? She gave me so many! I swear there is like 20 pairs of baby pants in just that one size! Same with onsies. How many of those does a baby actually need? I plan on going through them and getting rid of some because I dont think a baby needs that much but figured I would ask on here first.