This page recommends both online and offline activities for you to do with your child to stimulate the understanding of math concepts.
Children know many math concepts through early play.
As infants they know that they are small and their mother and father are big even though they do not know the words. Toddlers know that if they put one block on top of another, they will have two even though they do not know the words. They know that if they have 2 blocks and you have 10, you have more and they want them. Toddlers will often sort objects although we may not know the criteria they are using to form their sets. Very young children know the sequence of their day if there is a schedule to their day.