Breast feeding is quite hard on women and many women struggle to sustain the child on the breast alone. There’s a history of communal feeding which adds new energy into the equation and also mixed feeding once the child is old enough. I would say it’s probably a continuation at the peak metabolic rate described in the parent post.
Most women I know who struggled with breastfeeding were due to inability to have the baby correctly latched. Once the baby is latched, women shouldn’t have a problem with supply. Mother spends at most 500 calories extra when breastfeeding which most of the time comes from the weight that’s gained during pregnancy. I myself was able to exclusively breastfeed for 6 months after which we started introducing solids.
