I am looking at buying my niece a fall themed outfit. I found one that I like, but I can't decided what size to get her. She is 4 1/2 months old and weighs a little less than 15 lbs. The sizing chart says 3-6 months is 12-17 lbs and 6-12 months is 17-22lbs. I want her to be able to wear it up until around Thanksgiving when she will be about 6 1/2 months.. I think I should get the 3-6 months, but I am not sure.
Here is what I want to get: