Quoting AltAngel:" I am a first time mommy and I have absolutely no idea what to buy. Me and my fiancee want to buy stuff ... [snip!] ... The baby will be formula fed so other then that I dont know what all I need to buy her at the store next week."
Congratulations! These are my essentials that I would not trade for anything. I was (10 months ago) a first time mommy too and had no idea what was necessity and what was luxury. I just want to share my choices from my experience.
Convertable crib (like you said! something that will grow with them)
Waterproof mattress cover.
Changing table (this is a waste to some, but to me it saved my back and is so much easier changing her up higher)
Boppy (breast or bottle feeding is much easier with one)
Play pen with bassanet and changing table attachments (if you have a small apartment you might not need it, but we had some heat issues and were confined in one room where her crib didnt fit. the playpen saved us!)
We got a tavel system, but I wouldnt get it again ONLY because I would have gotten a convertable car seat if I could re-do that purchase. Its convenient, and if you have the money to do both, it is easier for the first few months to have the travel system. but we only put her car seat in the stroller for a few months- maybe 3 tops. If you go out alot and dont plan on keeping LO in for the first few months, i recommend one. they are too floppy for umbrella strollers.
Larger receiving blankets. The one carters sell were too small to swaddle with so we used the ones from the hospital.
VentAire bottles. I recommend them HIGHLY. The bottom and tops come off and we've NEVER had an issue with these. they've lasted 10 months so far and going strong (we had to change to bigger nipples along the way but theyre not expensive at all)
Thats all I can think of to recommend at the moment. Ill repost if I come up with anything else!!