I've only seen one hatchery that carries bantam brown leghorns, and I think it's Sandhill Preservation... not sure though. I'm betting your baby is a OEGB.
Edited to add: Not Sandhill Preservation. I'm looking around. I'll find it.
the first one is a Silver duckwing or golden duckwing.. hence the grey color on the head and lightness in the wings. what breed? I don't know.. The legs are yellow but most are as chicks. may change white.. who knows.