I bought these pullets in the coldest time of the year so I could get more eggs as soon as possible. Glad these birds are big (as babies) and hardy! They were virtually feathered at 4.5 weeks. At 5 weeks, I started to see the occasional feather dropped, as if they were already starting to molt into their adult plumage! The babies were noticeably bigger than the Amberlinks I bought in the same hatch date, so I'm expecting some big eggs. They seem to be growing quickly also, as of 6.5 weeks.