DS could add and subtract small numbers at 2.5 yrs and understand zero, ie 3 minus 3 is zero. He would then say zero is nothing.
He knew his numbers and could count various objects just before he was 2.
Is that within the normal range for maths ability?
Just before he turned 3 he could read simple sentences such as 'goldilocks and the three bears' or 'warning, hot pizza'
Should I be doing something more now or should I wait until he starts proper school?