By this age, your kiddo's vocabulary has increased tremendously. As he practices more reading and writing at school, his vocabulary is developing continuously and he also understands the relationship between letters and sounds.
What you need to know:
You will be happy to see your kiddo identifying many words by sight and also develop strategies to figure out what are the words he reads. He will be able to read a story book easily except for a few difficult words. Finding the missing letters in many given words is an easy task for him now. Because of his increased vocabulary and memory skills he is easily able to think and identify the words and fill either the beginning, middle or end letter to form the word.