Hi, my wife and I (and our 6 month old baby girl) are staying in Philly at the Sofitel for two nights. Any tips on great places for take-out near 17th and Sansom? I was thinking Susanna Foo. Suggestions?

Susanna Foo is an upscale restaurant. I'm not sure they do take out.
Try this site:
www.digphilly.com

www.diningin.com

Or just take your baby out with you. I find that eating earlier gets you nice quick service and less people likely to be annoyed by a fussing baby noise. Anything in Chinatown, other ethnic, BYOs, anything with outdoor seating, or obviously casual places work fine for us still. I might not go to Susanna Foo at any hour with a baby though.

make sure you stop for gelato at Capogiro's. It's somewhere near there (maybe 13th and Samsom?).

Penang in Chinatown (it's 10th Street near Arch) is pretty tasty Malaysian. They do deliver, but their prices are very reasonable, and the atmosphere is casual enough that you probably would be comfortable bringing your baby.