Abstract: A new and improved child's auxiliary toilet seat for a toilet includes a hinge pin assembly which includes a hinge pin and first hinge members connected to the toilet for receiving the hinge pin. A first toilet seat assembly has a large aperture for adults. A second toilet seat assembly includes a narrower aperture for children. The second seat portion includes a portion proximal to the water tank and a portion distal to the water tank. The second seat portion further includes a first side portion and a second side portion that extend between the proximal portion and the distal portion. The respective first side portion and the second side portion include respective leg supporting extension members which project toward each other from the respective first and second side portions, thereby narrowing the aperture for the children's use. A toilet seat cover covers the toilet seat assemblies.