It's hard to say - every kid is so different.

I have a 4 yr old in my care who doesn't really know her letters or numbers or how to spell her name. My own almost 3 yr old can tell me most letters or numbers when I ask her about them and can even spell her name. I also have a 21 mth old in my care who can barely say a word but yet I have a just-turned 2 yr old who has been talking well for months. It really varies.