The first sign many women notice is an overnight decrease in milk production on one side. (newbabynewpaltz.com)
The women in the study (there were only eight) reported a significant decrease in milk production after a single dose of Sudafed. (verywellfamily.com)
This may lead to early, unnecessary supplementation, which may then be followed by a real decrease in milk production; the baby stays asleep longer while breaking down the less - digestible proteins in a breastmilk substitute, and the mother's body does not receive the signal that more milk needs to be made (Walker, 2007). (kellymom.com)