Q: I got my period last December. I'm wondering when your breasts should be done developing because mine aren't...yet. When were you fully done?
A: Sweetie the time that you stop growing they will. That could be in 5 years or it could be next year you never kn ow what mother nature will throw at you. I am 13 turning 14 next week and I am 5'3 115 lbs and I had my period December 7. Wierd were both in December. Anyway my breasts are a 38 DD and I love them yet they are stil going to grow! Good luck hope I helped. Bye Bye! ( ;