DS age 5 is in Reception,. He's on yellow level books (about the middle of the class) and can read and sound out 4-letter words confidently. He knows all his phonics and can blend 'sh a r k', 'sh o p', 'l oo k', and similar words easily.
He seems to memorise words a lot of the time rather than reading/decoding them - we have 100 HF words to learn over the year and he's done the 100 and is on to the next 200!
What I'm worried about is blending/reading words over 5 letters long. He can sound them out but often gets the letters in the wrong order, reading from right to left (he's left handed, if this makes any difference) and just cannot seem to sound out more than 4 letters.
He will read longer words, instantly, that he 'knows' - school, his sister's name, etc.
Is this just a stage, and practice will help with it? What can I do to help him?
Thanks