he's 4 months now right?
have you adjusted his routine yet?
also, it wasn't until my lo was about 15 or so weeks before DH could calm her. even now, i'm usually the one that puts her down and i'm the one she's used to. maybe dh could try putting him down for a nap during the day so that if it doesn't work, you're there to help out and it's not the middle of the night. charlie will get used to his dad but he's probably just used to you right now for comfort and feeding. keep trying and i don't know if your dh gets a little stressed but charlie will notice it. just take it slow and try during the day for a bit until charlie gets more used to him. also, have your dh watch you (out of charlie's sight) while you're comforting charlie because it may also be that charlie is used to the way you rock, hold, him etc. and dh may do things differently and watch and see how you do it.
melissa