Way too small
I bought this for my son in a size 12 months. He is 9 months old and in the 10th percentile on weight and this shirt shrunk so much I had to squeeze him into it for a fathers day picture with his grandpa who we gave a matching adult size shirt. I'm sure that will shrink too. The shirt is adorable, but if you're going to buy, get at least 2 sizes bigger than you need.