My own son who has just turned three knew all of his letters upper and lower case and numbers to 20 by the times he was 2.5...... He says the alphabet, knows his shapes and colors too, now I have a 4 yr old dcg that just started jk in sept and could only write her name but didn't recognize any other letter. Or number. And couldn't print anything other then her name..... I tried and tried and she just cried so I gave up and it's in the parents and teachers hands. Same as another three yr old dcb I have doesn't know any letter or number and doesn't know the difference between the two. So I think my child is not the norm and for the daycare kids.... well not my job!