Reading Confidently at a very young age

My son, who is almost 5 years old, is now reading "My Father's Dragon" by Ruth Stiles Gannet. This is a wonderful book about a boy who travels to an island to save to baby dragon which has been enslaved by other wild animals.
It is very easy to read, and every page is filled with exciting events to keep the young reader fascinated.

Everyday, he reads a few pages from the book out loud to me. He is reading fluently and very confidently. He can read about 300 words in less than 10 minutes. On every page, there are usually only 2 or 3 words which he needs help with. Due to his strong foundation in phonics, He is able to figure out how to read certain words even though he has never seen them before.

Before reading My Father's Dragon, he has finished reading 3 books by Roald Dahl:
These are all wonderful books which he has enjoyed reading very much. Here is a page from the Minpins by Roald Dahl :

I am surprised that he is able to read those books before the age of 5. All thanks to the Ladybird Key Word (Peter and Jane) series, as well as phonics ! Check out my methods here :

How to teach phonics

Key Words with Ladybird

He has never attended any enrichment classes to learn phonics and reading. I have single-handedly taught him to read at home. It may seem that I have spent many hours a day teaching him. But the fact is that I am a full time working mommy, I can only afford to spend 15 minutes or less teaching each child (my girl and my boy) :

How do I manage to find the time to teach ?

My son is an average learner who needs many repetitions to learn something new. He also has a very short attention span and cannot sit still. I am amazed that he can finish reading Ladybird book 11a, and go on to read the books above, all before the age of 5. It proves that if we use the correct methods, and teach the child consistently, any child can read very well before he/she enters primary school !