How to choose a baby bath tub?

A few things to look out for when selecting a bathtub. #1 Comfortable contour which baby can fit comfortably inside. #2 bathtub that comes with removable sling or hammock to keep your newborn higher in the water #3 gentle incline to keep your younger baby lying supported in a slightly upright position #4 bathtub with resistant foam lining to prevent baby from slipping into the water. I'm currently using the one in photo attached which I had purchased from baby fair at price of about $50