You can choose a baby diaper based on the baby's size. Mamaearth's diapers come in size for a baby weighing 3-5 kgs (New Born), small size for a baby weighing 4-6 kg, medium size for a baby weighing 7-12 kg, the large size is for a baby weighing 9-14 kg and XXL diapers for babies weighing 12-17 kg or more.