Have you actually watched him while waking? Is it a startle or does he wake, look around and start crying? My 4 month old has sleep apnoea, which wakes him, but more like every hour, when he hits REM. There are a number of sleep conditions that you can eliminate- try and see HOW he wakes from sleep.
Perhaps you need to work out approx. time that your little one wakes and go in just prior and make sure the dummy is in a d perhaps put the music on do when he does wake, he knows it is time to go back to sleep?? I can't think of anything else, sorry
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