Designer Bums Cloth nappies are known for a nice, snug trim shape that fit MOST children. The nappies are suitable for use from newborn starting approximately 3.5kg all the way through to toddler toilet training age (approx 15+ kilos depending on individual body shape). At some growth phases particularly with chubby babes, the fit may not be perfect or run a little tight, however as the infant body rapidly changes so does the sizing on the nappy.