All I can tell you is this, Montessouri class rooms have all toys that when played with will result in the fine tuning of some skill of some sort. Such as: fine motor skills, reading (early reading includes doing things from left to right just do it becomes natural), categorizing colors, shapes, and bigger vs smaller, any others. They also teach the children to do things like when they help wash the tables, do wipe them from left to right to facilitate reading. I think if your toddler is behind on somethings like basic abc's 123's, colors and such, they will need something with more set curriculum. Monetessori uses all emergent curriculum, so mostly learning through playing. Learning can be fun, but playing in the house area wont teach a child EVERY thing they need to know. They need to do planned activities to give them structured learning environment. Leanring color through art is a great way to teach color, and mixing colors too. Look for a school that has curriculum planned especially for your child's age group. Then your child's teachers can adjust the curriculum accordingly. If you want a class for your child and they are "slow" as you said, then a regular learning environment should be suitable for him/her.