thx guys on the advice, and straight after the picture i cleaned all the poop of them, the reason for it being like that is cause i dont like to handle the chicks much cause i had a hen that rejected her chicks for some reason, and i would have put the chicks with another hen but ive only got 4 budgies
and the chicks have all cleared up now, i sprayed the nest with lice and mite spay