It is frighteningly easy to find that weaning happens without planning to, especially during the first year. Ideally breastmilk would be the baby's prime source of nutrition througout the first year, and if not, they need formula.
But it is so easy to find that milk supply drops. If mum encourages baby to night wean, if mum keeps baby seperate from her, if mum asks baby to wait for feeds, if mum schedules feeds, if mum doesn't offer regularly......
This can all be reversed! It is easy to up milk supply, but it takes a pro-active effort, sometimes. Skin to skin, keeping baby close, offering regularly, being alert to baby's cues are really effective ways of upping milk; but some mums feel uncomfortable doing this and prefer to switch to formula.
Melanie