Best thing to do right now is let mom care for them. Let them build some strength and get up and start moving around. Give them a while, they're new to this great big scary place!
I have baby kittens at home that are about two-three days old!!! Am I able to pick them up or pet them???
There is no problem to pick them up but for now let them be with their mother, she knows best how to get them used to theirenvironment. After that you can.