My son is 3 yrs old. I have not used any program or curriculem to teach him math. He already knows to count up to 20 and know 2D shapes and some of the 3D shapes.He can complete the pre k Comparison worksheets which i give him . I know this is not a big achivement so i am wondering to start a math program or a curricula with him
any advice or idear for me

( which program or curricula would you recommend )