My first instinct is a nap first thing in the morning and see if it helps. Also, is his belly full at those times. Since there is very little rhyme or reason for the outbursts this would be my guess even if the parents say he is getting enough sleep.

I had a little guy that was apparently getting 12 hours of sleep at night but always needed an hour nap here. He would then take the regular nap for two hours too. He was the whiniest kid on the planet without his naps.

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