This frizzle satin baby amuses me with the way the dark feathers coming in on his/her face are looking like little eyebrows right now. I thought others might get a chuckle out of it too. Sorry for the terrible picture quality.
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Oh goodness yeah boys can be such handfuls sometimes! I think figuring out how to deal with their hormonal little selves is one of the harder aspects of breeding.
Aww little munchkin. There could be something off but hopefully the little one catches up and will do ok. Slower feathering can happen due to a gene which is sex linked but your baby is feathering in even slower than most slow feathering ones I've seen. I had a little jubilee orpington baby once in an assortment from cackle hatchery that was so much slower to feather than the rest and he turned out just fine. I'm hoping it'll be the same for your baby.
Aww I hope they are fertile too and she turns out to be a good first time momma!

How adorable!
Oh yeah I think I know exactly what is going on there.
So your little white girl is recessive white. Recessive white is great at hiding all sorts of things but needs two copies to show being that it is recessive.
It was actually your buff laced polish who was giving the babies their white. This is because buff laced involves dominant white. Unlike recessive white dominant white lets red/buff bleed through. So if a gold laced bird has one or two copies of dominant white it will turn the areas that would be black laced white but leaves the gold/buff color. Dominant white is leaky when it only has one copy though hence the spots on the babies (this is how paint works in silkies too).

Your buff laced is probably homozygous for dominant white so always gives his babies one copy.
Your recessive white girl and your blue boy won't give you white chicks since he shouldn't be carrying recessive white to make any white chicks with her. What colors hatch depends on what she is hiding under her white but given you've already got black chicks I'd say blue and black chicks is most likely (blue since dad is going to give the blue gene to 50% of his babies and the other 50% won't get it so should be black). Splash from this pairing is only possible if your recessive white girl happened to carry blue. If she did carry blue you could get 25% splash, 50% blue, and 25% black offspring but I'm guessing she probably isn't carrying the blue so I'd expect 50% blue and 50% black. Oh and I've just got to say I love your blue cochin boy! He really is just so gorgeous!