White marks on black lab puppies?

My 2 and a half yrs old black lab female just labbored a litter of 10, unfortunately one was born dead. The rest of litter is fine Thanks God and very lively. But i have and issues about their markings. My female is pure bred and she haves a small diamond like mark on her chest. Dad is also black with little bigger marking. Anyway, all pups are black, but few of them have white marks unlike mum. One haves white circle under chin and one white thin stripe over chest and tummy. Anyway, i love them all, and i don't wanna sell them, i will gift them all to my friends who will take good care of them. Anyway my question is to black lab owners who already breded and is this markings my pups have alright? And hats max largeness mark they should have. Just kind answers please