Just wanted to come back and share sizing info. I bought them for all three of my little boys for photos. The smallest size was xxs. This size fits my 12 month old and is long but I was able to fold it in the back to make it less visible. The sleeves are a bit long. But in general everything is fine. The reason I didn't give 5 stars is because it's pretty cheaply made. The material is very thin. It's more of a summer thing. I was under the impression that it would be less transparent. In general a good shirt for photos and summer shows this year.
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