Hello! I recently got Fufu straight run from a local hatchery. His/her age wasn't known and thus I'm trying to figure out approximate age and if Fufu is a hen or roo. I've had her for 3 weeks now and she is significantly smaller than my other chicks and slightly smaller than my black cochin bantam. It this normal? Because of her size she seems to get bullied from time to time by the other chicks who are about 5 - 7 weeks old. Attached 3 photos from today and 3 from when I got her 3 weeks ago.