How many outfits for a 5 day vacation for baby?

Na

We will be 6 hours from home at the beach.. Baby girl will be 3 months old and I don't want over or under pack.

Worried about over packing because we will be in a small Aveo and I also have to pack for my 3 1/2 year old, husband and my self, pack beach toys and supplies and a cooler and baby stuff.