I am brand new to using wool for diapering - I was desperate to find a solution for overnight. My 2.5 y/o toddler is 34.5lbs and in the 98% for hight. I purchased a s4 so we would get the most use out of them as she grew. They fit well over her nighttime diaper with a little room. The leg openings are a little loose on her. They work perfectly after lanolized! The color is much lighter/dustier than I expected from the picture.