My mum asked me the other day if she could be at the hospital when I'm in labour. I didn't want to disappoint her by saying "no" outright, I just said that it could be in the middle of the night and the hospital might not let her wait around.
My sister was quite young when she had her first baby (she was still living at home when she accidentally fell pregnant to her now husband) and both myself and mum were in the delivery room as well as her partner, and our dad was in the lounge area just outside. She called mum when her waters broke because her partner had been drinking and wasn't sober enough to drive to the hospital! When other family came to visit later that day my mum would take the baby and carry my niece to each person - ensuring she got more "cuddle time" than anyone else - even my sister.
I think my mum envisions that she will be able to do the same sort of thing with the birth of my first baby, but truthfully this is an experience I want to share just with my DH. I'm 8 years older than my sister was with her first and have far more life experience. I'm married and have been living with my DH for years - I'm not the same scared little kid my sister was when she had her first (she was quite an immature 20 yr old checkout chick at the time). I don't feel that I'm going to need my mum, and I don't want her to hog the baby as soon as its born - but I don't know how to tell her this without breaking her heart