I'd really like to know how often should a newborn feed?

It depends : Newborn are only being fed with milk so it depends on whether you are breast feeding or formula feeding formula fed babies usually feed every three or four hours during the day and once or twice during night..Many newborn need 8 to 12 feedings a day breast fed babies can also be fed on demand till milk production is plenty, than they can be on a schedule if possible untill you start with stage one.