Can y'all help me with this?

[CrazyChickLady64]

Hello all, I have 10 7 week old babies all have there feathers but this one still doesn't have feathers on his back under his wings on either side of his back. Is this something I sho be concerned about? The mother is an Easter egger and dad is a cochin. Thanks

 

[DobieLover]

There are pin feathers coming in in those areas.