Well if its tailgating, I say hot dogs (boil or grill them quick w/ a george foreman grill) chips (doritos, lays, tostitos) & salsa, maybe even popcorn. Soda and/or punch w/ the red dixie cups, lol. Probably some cookies too so you'll have something sweet.
3-6 foot subs (make sure you have at least one that is all veggie. Chips and dip, veggie tray with dip, and fruit. Not sure if you are doing a cake...but if not you can have cookies and even decorate them and line them up to "say something"...congrats or whatever. Put out some pennants with babies name or sex or just baby if you're not sure. Hot apple cider and cold pop/beer.
Re: Need food ideas
Chicken wings. Can't forget the chicken wings