It's never too early to start reading!
From a few months ago my daughter was able to say all the names of her teachers and friends at nursery school. The teachers have told us that she says hello to all of her classmates individually in the mornings.
So now when we review the abc’s which is about once a day. I ask her to find the first letter of her teachers’ and friends’ names. For example where is “S for Suzuki Sensei” or “T for Taro-kun.” Of course I’ve changed the names in this case but at this point she is able to locate the first letters of all of her teachers and some of her friends. I am amazed by this ability. It doesn’t matter which book or chart of abc’s I show her she is able to pick out the first letter correctly most times. She is still just two years old but already picking up the basic skills of letter recognition. This is the first step to reading. I am not sure I could do this at her age.
After having my own child I now know how important it is to start learning a language at an early age. Her Japanese is developing faster and stronger than her English is so it is important to give her as much exposure to English as possible because now is the best time for her to pick up language.