Check in as much luggage as you can. Only take the smallest possible diaper bag in the plane and if possible, use that diaper bag as your purse also (keep your id, wallet and stuff in it instead of carrying a separate purse).
^ That is so true.
I was once traveling with a 6 month old, had to hand in the stroller, and had so much stuff to carry, WITH the baby.I was nearly in tears by the end of it....It was really bad experience :/