Are they stiff.. perhaps covered in traces of albumin from hatching?
Well, I can't see the specific issue but scroll to around page 51 ish of the following link to see some incubation/hatching anomalies and POSSIBLE causes..
https://www.hubbardbreeders.com/media/incubation_guideen__053407700_1525_26062017.pdf
Let's see.. Emerald.. the black sex link was not melanistic like this babe.. who's your roo? I see feathered legs and 5 toes.. There's some Silkie in the mix here.. I'm thinking..
Usually known as barnyard cross.. some folks call silkie crosses Satin.. because first generation crosses are always hard feathered. Doesn't look really crested or bearded though.. I would expect at least a crest if my Silkie thought were accurate.