2 year old and newborn

I'm expecting a baby early October. my son will be 23 months by then. as of right now I'm having some anxiety because he is really attached to me and I love it I really do but I'm scared for when the baby comes that his sleep patterns will get ruined, especially at night . I strongly think if I try to put him in his crib he will not have it. also he climbs out so quickly. he does not sleep with anyone but me. does anyone have any suggestions?