I adopted two little 3 week old piggies (sows) about 3 months ago and right off the bat they were very quiet, sweet little angels. They are about 3 and a half months old now, and it seems their personalities have started to change.

They are going from sweet and quiet to wild and busy (sometimes nippy). Is this just puberty? Will they grow out of it? (They are 100% healthy says the vet).

Please help me?