I purchased this with the idea that kids can't have bulky coats on in their car seat, but I wanted my little dude to have something on. It has been perfect! I bought it when he was 12 months old (in September-ish), and have used it all fall and winter long (he is now almost 19 months). He is very average height and weight (50th percentile in each). Great quality, perfect fit, thin enough for the car seat, warm enough that at least he had something on!