As a teacher I have advised a lot of parents over the years to get their children looked at by a speech therapist, you'd be amazed how many say "oh no they'll be fine.." etc This is in Yr 1or 2 as well.
Make sure its a good speech therapist, I took DS to a complete dud this year!!

You are doing the best thing you can for your DSS and in the long run he will be much better off for having you in his life.