7 months pregnant, what else do we need to buy?

A carrier would be nice. They allow you to carry baby, but to keep your hands free...really useful during the first weeks/mos. I use the Ergobaby carrier, and I really like it. Also, one of those teddy bears that plays womb sounds...not an essential, but my baby found it soothing. Gas medicine is good to have on hand...either Mylicon or Baby's Bliss (all natural). Some of them have a lot of gas at first. Buy lots of diapers and food for the first couple weeks, because you might not want to leave the house for awhile. I didn't venture out until day 6, and then not again til week 2 or so. If you are going to feed, a Boppy or something like it is good, too, and have some good books on hand if you like to read. They nurse a lot at first, so it's nice to have something to do while nursing. Congrats! Get as much rest as possible now:)