When I was preggers I started giving DH birthday and Christmas presents from baby.
I got him books about Daddy and baby (Guess how much I love you, My Dad, My Daddy is magic, Things I like.. hehe lots!) and wrote messages inside saying things like "Happy birthday daddy, I can't wait to come out and do all of these fun things with you"
I also started giving him the traditional 'Dad' presents, socks, undies, ties, mugs, From baby