The image above, taken from the Markers of Lactation Insufficiency paper by Huggins, Petok and Mierles shows the three different types of glandular insufficiency. (breastfeeding-babies.com)
The woman's psychological state, especially if she is depressed or anxious about her ability to care for the infant she has given birth to, can contribute to perceived lactation insufficiency (Dykes & Williams, 1999). (kellymom.com)
Breast Reduction and Augmentation The possibility of lactation insufficiency jumps to 50 % if you have had an augmentation. (pregnancy-info.net)