Hair: Munchkin

Most Useful New Infant Item You had...please share...especially Preemie Parents

So my SIL gave birth VERY early last week..at 30.5 weeks gestation. My niece weighed in at 2 lbs, 1 oz. She has done miraculously..no vent the whole time, no emergencies and while she has not gained any weight yet, she is maintaining her birth weight at this point. She looks wonderful...even a full head of hair! I thought fat and hair grew last?? She is a tiny little spectacular miracle! She will be needing some selections of preemie clothes, and other such things. But I am wondering what were the most useful things you had for Preemies...