Abstract: A child's toilet seat assembly includes a mount which is attachable to the toilet bowl of a common adult-sized toilet and a child's seat body which is securable to the mount in a snap-fit relationship therewith. The mount includes a base having wing sections which are securable to the bowl with bolts used to secure the adult-sized seat atop the upper rim of the toilet bowl and rounded portions which are maintained in an elevated condition above the base. The child's seat includes a body having portions which cooperate with the rounded portions of the mount to permit the body of the child's seat to be interfitted with the mount in a snap-fit relationship therewith. When joined together, the body of the child's seat can be pivoted between raised and lowered positions without interfering with the movement of or the use of the adult-sized seat.