Weaning from the heat lamp

[SueT]

When was the photo taken? I agree, they do not look 4 weeks. Leave the heat available!

Here are some of mine at 3-4 weeks. D'Uccle, Sebright 3 wks, Australorp 4 weeks

And a 2 wk and 3 wk chart from Purina

 

[Mamatomany123]

Heres another around 4 weeks

 

[pibb]

The chicks in your post #4 looks like they are about 2 weeks old to me. I think someone was pulling your leg. No way they are 4 weeks old. They do need heat since they are not fully feathered.