It will be easier to tell when they get older.
What I can and cannot tell now:
The pale chick in the first picture does not have feathered feet, or a crest on its head, and I do not think it has extra toes. So I know it is not a Silkie, a Cochin, a Brahma, a Polish, a Sultan, or a d'Uccle. I cannot see the comb type clearly, so it could possibly be a Japanese Bantam, or an Old English Game Bantam, or a Cornish Bantam, or an Easter Egger Bantam or some other breed yet. When it grows up, the color might be White, Black Tailed White, Wheaten, Buff, or quite a few other options.
The darkest chick is likely to be black or blue colored when mature, but it could possibly be partridge or birchen or a few other options. I cannot see comb type, foot color, number of toes, or whether it has feathered feet. I do not think it has a crest, so probably not Polish or Silkie.
The reddish-brown one has at least as many possible options as the lightest one, although the list of colors is entirely different. I don't think it has a crest, so not Polish or Silkie. I cannot tell comb type, foot color, number of toes, or whether it has feathered feet.
Another thing I can tell now is that they're all cute
