MATH is the third stage in the process. It is the next step after your little explorer is comfortable with the Alphabet. On the average, we have introduced the Numbers to our little geniuses on their third birthday. At the same time, don't hesitate to stimulate their discoveries even sooner. So, let them discover numbers 1 through 10. Once they are comfortable with that, challenge them with the concept of double and triple digit numbers: 10, 20, and 30, through 100.
These are truly exciting first steps of your little genius to observe!