all schools start admission when the child can walk - however, all require adult company (caregiver, mother, etc.) Only Best Concept does not allow adult to go with the child, and the minimum age of admission is 18 months.
your child will cry a lot at Best Concept at first (separation anxiety), but usually the child will be OK within a month. My older daughter also goes there. When my son first started at 18 months, he would sometimes look for his sister who is in the casa class.