My ds has started to count, and so far has mastered up to 6 on his own plus adding in numbers up to 13 (number of stairs in house) if I stop randomly.
He knows 3/4 of the letters in the alphabet as he has some foam ones in the bath. For example, c is for cuddle, so I can ask him to find the letter in the water or point to the letter and ask him what it stands for.
Is this normal at his age - he is 2.1?