Size by weight: Size 4 fits babies 13-24lbs (6-11kg) Key Features: Our most comfortable fit to protect your baby's skin against red marks and leaks 2x wider* soft leg cuffs help prevent leaks around the legs (*vs before) Stop & Protect Pocket helps stop leaks at the back 360° ultra-soft waistband flexes to your little one's body as they move around Super absorbent core that absorbs wetness and pull mess away from skin instantly Easy nappy changes: easy on, easy tear off, roll, stick & dispose Approved by the dermatologists of the Skin Health Alliance and tested and certified according to Standard 100 by OEKO-TEX 100% leak-free night.