He's more advanced than my 5.5yo son that just started Kindergarten in this respect. My son has knows his letters since age 2, his numbers shortly after, and he's been able to write his name since around age 3.5, but he's just now showing an interest in phonics and reading. However, he has always shown an intense interest in math. As such, he knows basic addition and subtraction (courtesy of the number line and Team Umizoomi), and is currently asking me about money, fractions, and multiplication.
My 2.5yo daughter, on the other hand, can count to 25 and tell you number up to 50, but doesn't know all of her alphabet yet. Also opposite of my son, she is showing a much greater interest in writing (especially her name) and coloring. She knows her colors, shapes, patterns, etc, and I know that if I actually work with her, she'll get her letters also. However.....
Let him be a kid! Encourage him to learn, expose him to the things you want him to learn, but no pressure or regimens :) It's much more fun for kids to learn in everyday life. What shape and color is the stop sign? Do we go on green or red? Let's count the number of squares on this sidewalk. And so on....
