I bought these for my daughter as some nice long-sleeve onesies for the winter, and it was an epic fail. I knew Gerber runs small, but I figured I'd be ok with the 3-6 months size since she's just barely started wearing that size and some of her clothes are still 0-3 months, even though she's six months old (she's long and thin). These ought to be labeled 0-3 months, if even that; they're already too tight and too short on her, and the sleeve length is to her elbows--nowhere near long sleeves. And are they good for winter? No. The material is so thin they'd be much better for summer. These were a complete waste of money.