When my dd was born we bought our ds a baby doll of his own, along with the "stuff" to go with it. We made a big deal about how he could take care of "his baby" while we took care of his sister.
I know some people thought it would make him a "sissy", but that was crap. He was the "Daddy", and whenever I fed his sister, he could feed his baby, pretend to change the diaper, etc.
It really helped a LOT. Now he's 16 and very "macho" but is also extremely gentle with little kids (lol he was embarrassed to have people know he babysits and does mentoring with younger kids and stuff, until his gf re-assured him it really is sweet LOL). Plus, he wasn't as jealous of our dd. I think the doll helped with all this.
I also made a HUGE deal about letting him help with the new baby, about how I couldn't do it without him getting me a diaper, bringing me a blanket, etc.
I also made special "big kid time" just for him and I.
at 6:08 AM on Feb. 4, 2009