Thanks for all your replies, I am just wondering how much bigger Mia will get in case I order her some new clothes, she is 5 1/2 months old now and almost 3 pounds. She only weighed 1 pound and 7 ounces at 12 weeks. She has already doubled her size. she is still very small, and can wear extra small now, I am thinking maybe I should order a regular small in case she grows more.