One toilet and one hand washing fixture (sink) should be provided for every group of children when that group size is less than 10 children. This applies to toddlers.
Preschool-age children. If each group size is less than 10 children, provide one sink and one toilet per group. If each group size is between 10 to 16 children, provide two sinks and two flush toilets for each group.
School-age children - If each group size is less than 10 children. provide one sink and one toilet per group. If each group size is between 10 to 20 children, provide two sinks and two toilets per group. Provide separation of male and female toilets.