The phrase "malnourished mothers" means that the mothers are not getting enough healthy food and nutrients in their diet, which can negatively affect their health and well-being. Full definition
Can malnourished mothers produce enough milk to breastfeed successfully? (rehydrate.org)
Therefore, although maternal malnutrition is not considered an important constraint to breastfeeding for most mothers, giving additional food to malnourished mothers during pregnancy and / or lactation may help increase milk production and will certainly improve their own nutritional status and provide additional energy to care for themselves and their families. (rehydrate.org)
Correcting the nutrition of malnourished mothers or children is only part of the problem. (foodpolitics.com)