I bought some chickens at 2 months old according to the breeder. I already had an Ameracana that was a Rooster now I am worried about my other two. I think the Barred Rock is a hen but what bout the Rhode Island? She was a bit smaller when we got her. We have had them for 13 weeks so they are between 15-21 weeks old according to that breeder, which I don't really trust.