My baby is 10 days old . I have been expressing breast milk and also using formula milk as he has had difficulties latching on . However after purchasing nipple guards he can now latch on and I would like to mostly breast feed him. I am unsure as to whether I should continue expressing as well ? Do I need to express so that my breasts do not become too painful? When is the best time to express eg. After every feed or just when we need the milk e.g. If someone else is to feed him? Any tips/ advice gratefully received as it feels like a minefield!