Most pediatric guidelines (CDC, AAP) suggest children recognize about ten letters by age four, and write some letters of their name by age five. That is a benchmark, not a deadline. Children who don't know letters at three are not behind — children who don't *enjoy* literacy at five are at higher risk.
Read together. Sing the alphabet, but sing it slowly. Point to letters in the world.
The relationship to print, formed early, predicts reading more than letter-knowledge speed..
