So I have a 4 month old male and I'm adopting his 4 month old friend I'm going to call Little Girl. They've been together since they were itty bitty. He is a Lop, not sure what kind, he's already about 6 or 7 pounds, and she is a little Lionhead. Neither are fixed. If I allow them to have babies, I already have ten friends and family who are willing to take the babies. Question is, should I allow them to breed? If I do, will giving birth harm Little Girl, with her being so much smaller than Thumper. She's about 2 times smaller than him.