Is it true that you should never let a newborn sleep more than 3 hours?

ericamanuela

I'm sure this never happens but what if a newborn sleeps for over 3 hours? I was told in my breastfeeding class that you have to wake him up after 3 hours to feed him and that you cannot allow him to sleep any longer than that. Is this true? Like I said, I'm sure newborns never sleep that long in the beginning but say he does for some reason, do I really need to wake him?