It's very unlikely his diet has any relationship to the delay in
speechHearing or speech impairment - resources
Speech disorders/language. Standing on its own, however, it certainly is high in carbohydrates, and it wouldmake sense to reduce that component of his diet. The surest way to do this is to eliminate such things as french fries, candy, cookies from the household. It's your responsibility to make available to your son healthy foods.
SimplySimply sleep don't permit the 'junk' to come into the house. Relative to the
speechHearing or speech impairment - resources
Speech disorders/language delay, there seems
littleLittle noses decongestant
Little tummys doubt that the many languages to which your son has been exposed would be a problem. It would be prudent to have him examined by a speech/language pathologist, to rule out any structural problems with his speech apparatus. Beyond that, my guess is that he will do much better once exposed to a single language over an extended period of time.
the good news is that you describe your son as happy and well-adjusted otherwise....
good luck