My dark Olive Egger chick isn't maturing when it comes to feathering out like the rest. My last one like this (Silver Penciled Rock) died at 3 weeks old despite acting healthy. I'm really worried that Olive will end up the same way. I realize she is only 1 week old and it appears she is growing in size, just not feathering out. The rest have larger wing feathers and starting on tail feathers already. She is also my husband's favorite, the only chick he truly loves! She's inquisitive, energetic, eats, drinks, and her poops look good. Should I be worried? Should I be dosing her with a drop of nutri drench twice a day for a few days to help her internally?