I just got my first two baby chicks (both hens) about a week ago, one Barred Rock and one Rhode Island Red. They were probably 1-2 weeks old when I bought them. I was wondering how fast one should grow relative to the other, because while the Barred Rock has been growing quickly, the RIR hasn't seemed to grow at all. They were pretty similar in size when I got them, but now the BR is around 4 inches long while the RIR is maybe 2.5-3 inches long. Both are pretty active and do eat/drink, but the RIR is almost always chirping, even when "sleeping", while the BR lies down to sleep. Is this normal or should I be adding anything to the RIR's diet? Any advice would be greatly appreciated. Thanks.