In breastfeeding women, low milk supply, also known as lactation insufficiency, insufficient milk syndrome,  agalactia, agalactorrhea, hypogalactia or hypogalactorrhea, is the production of breast milk in daily volumes that do not fully meet the nutritional needs of her infant. Breast milk supply augments in response to the babys demand for milk, and decreases when milk is allowed to remain in the breasts. Low milk supply is usually caused by allowing milk to remain in the breasts for long periods of time, or insufficiently draining the breasts during feeds. It is usually preventable, unless caused by medical conditions that have been estimated to affect five to fifteen percent of women.Several common misconceptions often lead mothers to believe they have insufficient milk when they are in fact producing enough. Actual low milk supply is likely if the baby is latching and swallowing well at the breast, is nevertheless not growing well or is showing signs of dehydration or malnutrition, and does not have a medical condition that would explain the lack of growth. The main method for increasing milk supply is improved breastfeeding practices and/or expressing milk through pumping or hand expression. The medication domperidone increases milk supply for some women. For mothers who cannot breastfeed exclusively, breastfeeding as much as possible, with supplementary formula feeding as necessary, offers many benefits over formula alone. Causes
Low milk supply can be either primary (caused by medical conditions or anatomical issues in the mother), secondary (caused by not thoroughly and regularly removing milk from the breasts) or both.
For these herbs, there are anecdotal reports of efficacy which may be due to placebo effect. Scientific evidence for the efficacy of herbal galactagogues is insufficient or nonexistent. The Academy of Breastfeeding Medicine protocol for low milk supply says that there is insufficient data to recommend specific medicinal or herbal galactagogues, but that some substances may be useful in some cases.A Cochrane review showed that, despite the relatively large number of randomised controlled trials investigating medical and natural galactogogues, it is uncertain whether galactogogues have any effect on breastfeeding rates. Supplementary feeding
If the mothers milk supply is insufficient, formula or (preferably) donor milk is necessary in order for the infant to obtain adequate nutrients. Supplements should be given immediately after a breastfeeding session, rather than in place of a breastfeeding session.The use of supplements is gradually tapered off as the mothers own milk supply rebounds. In some cases, especially when low supply is caused by medical conditions such as insufficient glandular tissue, long-term use of supplements is necessary. For mothers who cannot breastfeed exclusively, breastfeeding as much as possible, with formula feeding as necessary, offers many benefits over formula alone. See also
Breastfeeding difficulties
Lactation

References
Bibliography
Lawrence, Ruth (2016). Breastfeeding : a guide for the medical profession, 8th edition. Philadelphia, PA: Elsevier. ISBN 978-0-323-35776-0.