I have a barred rock hen and black sex link rooster and 4 chicks from the hatch. The chicks are about 4 months old now and 2 look just like their mama. The other 2 are black kinda like their dad. The black ones both have had black combs since they were born and the combs are still short apart from the others. I don't know if this is a problem or not but I just wanted to make sure it wasn't going to kill them or something. Should I be worried about it? I also figured it might be because of gender but I just don't know.