In my first batch of 4 chicks, 3 have doubled in size and wing feathers are developing rapidly. These chicks are roughly 1 1/2 weeks old . The 4th chick has hardly grown with almost no wing development . I “think” she’s a cream legbar, but not sure. (I got a Whiting True Blue, rose comb leghorn, Ameraucana and a cream legbar, according to the signage). Here’s the question: should I be concerned she’s not grown or feathered out like the others? Her poop is fine, she’s eating & drinking well & running around with the bigger girls just fine. Pictures attached. In the picture with 2 chicks circled for comparison, they were both from the same batch. The other picture of the 3 chicks are all from the same batch, so I assumed they would be similar in size. She looks slightly larger than the new chicks I got this week at just a few days old. Thoughts?