We are picking up two bottle babies to join our small herd. The ones we have currently are Nigerian dwarfs and we got them after they were weaned. The ones we are getting are sanann/Nubian and Nubian/lamancha mixes that are a few days old. We'd like to put some diapers on them and keep them inside till it gets warmer out. What size diaper do you think they'd wear? What about baby onsie size?