All bumGenius One-Size Cloth Diapers include a small, lightweight insert for newborns and a larger one-size insert for your growing baby. When your baby outgrows the newborn insert, it works as an overnight booster or as extra absorbency for heavy wetters. Cloth diapering has never been so easy! bumGenius One-Size Cloth Diapers feature our patent pending butterfly closure system to provide a comfortable, trim fit. This simple design makes cloth diapering as easy as using disposables. The familiar design makes bumGenius one-size cloth diapers perfect for care providers who might be resistant to cloth diapering (including daycares). Less Clutter bumGenius One-Size Cloth Diapers fit most babies from 3-15kilos pounds. No more sorting by size or having to carry multiple diapers when going out. Three snap-downs on the front of the diaper* allow you to easily adjust the size of the diaper as your baby grows. For newborns, fold down the insert stopper for an extra-small rise.