I actually buy for friends as their gifts. We are all consignment shoppers. It's addicting;) so I have two new born girls, a 3 month boy, a 6 month boy. I pretty much get all sizes in boys or girls if its under 12 months because I know someone will use them.
When I throw baby showers I get a really nice box from hobby lobby or michaels and put like 50 things all different sizes.