Make up a rhythm for your child to echo back to you. Take time to sing counting songs too. Match them up. Matching and comparing are essential skill activities in math development. Look for the patterns in your environment.
Measurement is a natural extension of matching and estimating.
To measure, your child has to match a series of objects to the length or width of something. Count them and see. Then measure the counter with soup spoons. Your child can use nonstandard measuring items for practical purposes too. Exactly the opposite.