Baby boy....
And 8 weeks is very early.
They will eat independently and normally will know to use the litter tray, but they still will be drinking from the mother, too.
So untill they have had both rounds of vaccinations (first at 9 weeks, second at 12 weeks) the mother's milk gives them extra antibodies till they have built up their immunity, themselves.
Moreover, the kittens learn a lot of social skills in these last 4 weeks, like playing with retracted claws, not drawing blood when biting during a playfight, reading the signals when another cat or a human has had enough....
And generally becoming less dependent on mommy.
I have a cat that was parted from her mother too soon, and she is suckling on my clothes all the time. I have to hold her like a little baby.
It's quite cute, of course, but it is in fact obsessive behaviour of a cat that hasn't had the chance to suckle with mommy long enough.
In her case there was nothing to be done about it, she was found on a campsite without mother or siblings, and there was no other nursing queen available to take her on. But if mother cat is available, please let him stay with her for 12 weeks, it is so much better for him, both healthwise and socially. You will get a more confident, physically and mentally healthier kitten that way.