If you only have an English stick, you can teach him more. My daughter will sing the English song "Happy Birthday to You" before she goes to kindergarten, and her pronunciation is very standard. Of course, you can also start with 24 letters. I think it's too early.
For example, some kindergartens in Shenzhen can speak English after graduating from a large class, but I don't know if I mean it or what I think. I feel that Chinese still needs to recite more words. If you have environment, you can practice more. Too many things are given to children too early, and they may not be written down. Children's memories are still developing and their memories have not yet been decided. I don't necessarily remember anything before I was 6 or 8 years old, let alone English education.