Baby eating every 5 or 6 hours and sleeping through the night ?

This mom that I know said her baby eats every 5-6 hours and sleeps through the night at only 4 months old . Does this seem right ? My baby is 4 months old and eats every 3 hours during the day and he does sleep through the night .

Added: I’m not asking about the sleeping through the night . My baby sleeps through the night as well. I’m asking about eating every 5-6 hours . My pediatrician told me that my baby needs to be eating every 3 hours and he drinks 6 oz at every feeding .