A bathtub insert is described herein that includes a bathtub shell that with a back support, and opposite first and second walls connected to the back support. A front support is connected to the bathtub shell. The front support includes a belt portion that has first and second ends mounted to the shell, and a downwardly extending support portion that includes a comfort opening and a cover configured to cover at least a part of the comfort opening. A strap for a bathtub insert is also disclosed, along with methods for using the bathtub insert and strap to support a baby for a bath.