Newborn clothing necessities? Help

Samantha

So unfortunately for my baby shower I received a lot of cute clothes ranging from 0 to 3 months or 3 to 6 months. I do have a good amount of onesies... I think.

I have a couple pieces of clothing in newborn size. My question is what do I really need clothing wise for the first 6 weeks? My baby will be born May 31st in Arizona, so it will be warm.