This tub grows with your baby through three stages: Newborn (0-3 months; up to 15 lbs), infant (3-6 months; up to 20 lbs) and sitters (6+ months; up to 25 lbs). The mesh Smart Sling provides comfort-edge support and locks into two ergonomic positions: upper position: offers head-to-toe newborn cradling and the lower position: supports infants learning to sit. You can remove the sling completely when your baby sits upright. It has a swivel hook for hanging on showerhead, shower bar or towel bar.