Four-stage bath center now features “Sit-Me-Up Support” to aid unsteady sitters in the tub. From newborn, to infant to toddler, this tub adapts to Mom’s and baby’s changing needs at every stage! Age Grade: Newborn Sling: 0 to 3 Months, Max weight: 15 LBS (6.8 KG). Infant Insert: 3 to 6 Months, Max weight: 20 LBS (9 KG). Sit-Me-Up Support: 6 to 9 Months, Max weight: 25 LBS (11.3 KG). Toddler Tub: 9+ Months, Max weight 25 LBS (11.3 KG).