My newborn sleeps continuously up to 4 hrs with out any feed, should I wake him up in between for feeds?

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No

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First month you need to wake him every 3 hours because he could get hipoglicemic if he is not fed for too long. Around 2 months he will wake up when he'll get hungry. My baby is 2 and a half and some nights sleeps for 6 hours and some nights asks to be fed after 2 hours.

No need