Interesting Colours in GCC Babies

[Auroras_Mummy]

Hi, my husband and I breed GCCs (a Y/S male and a Pineapple female) and this year we have 2 chicks with some interesting colouring. We've contacted our birds breeder and she doesn't recognise the markings so I thought I'd try here and see if anyone knows anything.
There are 2 Y/S females that have striping on their chest and cheek feathers. 1 of them is still feathering out a bit so it's a little hard to see on her chest but it looks like she'll develop the same green stripe on the bottom of her red feathers on her chest. The older 1 is much more feathered so it's easier to see that she has yellow stripes on her green cheeks and green stripes on her red chest feathers. The older baby also has 1 pink toe and toenail so I've been leaning towards a pied gene? But really not sure.
I noticed tonight our 2 Pineapple males have red stripes on the under sides of their wings? I'll try and get a picture.
Neither of their parents show any stripes although the dad (Y/S) does have yellow mottling on his cheeks.
Thanks for any help at all

 

[Flboy]

Very pretty! Bumping you back into daylight!

 

[Teknogeddon]

//SWOONS// So pretty! Look how little! >A<
Maybe it's something they grow out of? Its precious whatever it is.