Light Brahma Chicks 1 day Old 2 have black marks on their heads

[crazy-chickenlady-nz]

2 of My brahma chicks have black marks on their heads, it's my first time hatching them
Also has anybody feather sexed them I'm not to worried what mine are just interested

 

[Peaches Lee]

Love them, they're so cute!

Does look like little black feathers. Not familiar with Brahmas--maybe it's normal?