I should take a star off for their sizing but I think they are so great that I won't. If you are reading this then you'll know to order the next size up.  If your baby has super fat legs you might not want to buy these.  My little girl is in the 50% for height and weight.  She is 6 months old and weights 15 pounds 12 ounces and is 26 1/4" tall.  She is just growing out of her 6-9 month ones so I bought her these.  She was able to wear her Bum Genius diapers in them (the 6-9 mo ones) until recently.  These are great for wearing under dresses.  I got several dresses at my shower that she will have outgrown before summer so instead of freezing her or not using the dresses I use these leggings. One in white and one in cream. Hope this helps!