I bought this snowsuit for my almost 8-month-old right before the Texas ice storm hit in February of 2021. I was so glad to have it as power ended up going out for a week, so it kept him warm until we found a place to stay with power for that week. I bought the 6-9-month size after reading the reviews that said it runs big. My baby wears a lot of Carters branded stuff, so Im familiar with their sizing. My baby is totally normal in weight, and he was only wearing a short-sleeved onesie with socks underneath it, and yet I could barely get the darned thing zipped up over him. He was clearly a bit uncomfortable too, it was quite snug. It served the purpose for which we purchased it, but I do wish that I had ordered a size up. Overall, it was a great product, great quality, very warm, just sized strangely.