These are very cute tights of good quality. they fit perfectly. I am 0-3 months old, my baby is 36 weeks old so rather small. She weighs about 10-11 pounds, is 23 tall and almost 3 months old. So if your baby is a larger size, I recommend choosing a larger size so that it can fit longer. Definitely going up a size after my child outgrows this set. They're fat enough for winter and can't forget how cute they are.