It is common to worry about infant safety during bath time, especially in slick plastic tubs. While some parents experiment with placing cloths inside the tub for extra grip, most find that once a baby hits the 4 to 6-month mark, the best solution is to simply remove any internal slings or cushions that have become too small. As your baby develops the strength to sit up, a standard, well-sized tub without extra attachments often provides the most stability and comfort.