Okay, the question is not what it really seems like.
I started a baby chicken house(since I'm a girl and I think that the baby chickens look way too cute). I started out by using chicken spawn eggs. Weird thing was, every chicken I spawned was a baby. Just like I wanted. So then I go up to my newly made bedroom to admire how good a job I did making the bedroom. Then when I go to the chicken house, some of the chickens are ducking adolescents! I'm pretty sure when I spawned them they were all babies. And I didn't feed them anything, I was just keeping them as pets, and all they did was fly around.
What is happening?