I hope this is the right place for this thread.
My son is being raised bilingual, we are doing OPOL and English is the minority language. He started speaking at around 21 months and he is now two and a half. He speaks a lot less English than his community language, which is French, but his understanding is very good. Other than speaking to him in English, the main tool I am using to improve his language acquisition is reading, which he loves. We read to him a lot in both languages.
I was a pretty early reader and was able to read simple phrases by the age of 3, so I know that my parents must have taught me the alphabet and how to read some words when I was around the age my son is now.
If we lived in the UK and English was his community language then I don't think I would hesitate to start teaching him about the alphabet and letters soon. But we live in France and next September he will be going to school where obviously they will start teaching him to read in French.
Will I confuse him if I start teaching him to read in English and then he goes to school and they start teaching him that different sounds go with the same letters?