Babies can generally start sitting in the bathtub with support once they have developed sufficient head and neck control, usually around 4 to 6 months of age. However, it's important to consider your baby's individual development and consult with your pediatrician for guidance. Before your baby can sit independently in the bathtub, you can use infant bath supports or reclining bath seats that provide stability and prevent slipping. These products are designed to keep your baby in a safe position while bathing. As your baby grows stronger and gains more sitting balance, you can gradually transition to a regular baby bathtub or use a non-slip bath mat to provide stability and prevent accidents. Always supervise your baby closely during bath time, regardless of their sitting ability. Keep one hand on your baby at all times to ensure their safety and prevent any accidents or slips. Remember to follow general water safety guidelines, such as using warm water, checking water temperature with a bath thermometer or your elbow before placing your baby in the tub, and never leaving your baby unattended in the bathtub.