Hi mums and dads,
this is always an interesting question and the video on this page maybe worth your while.
Just before my daughter eva was turning two, we wrote down each word that she can speak (733 words exactly) & another list of words which she could read ( this was a very tiny list )...
Anyways, parenthood is always challenging & rewarding. There's no right time to start teaching. Just do what feels right!
here's a video you can watch to answer some questions:
http://fixtons.com/childrenlearntoread