If your cat is okay with it, and you have had your cat a long time, she is not a recent stray or feral, holding them just briefly right at first is fine. If your cat is a rescue, or a feral I would not recommend you holding them until they are at least 2 weeks old, and then be very careful when you do. Momcats are very protective.
thanks for the replys i only got her on tuesday as i foster she does have the kinda tempermant which makes me think she would be ok but with not knowing her very well i might wait although she is very loving she tried giving birth to them on my knee