[CrHn3]

The line from that article is a poor interpretation of that study.

The study says, "Psychosocial stress may affect the composition of breast milk via several pathways."

If I'm reading it correctly, a single sample was taken from 146 women. Breastmilk composition tends to be higher in fats and carbohydrates in the first few weeks of life and varies by time of day[1]. It's highly variable (even within a single feeding) in composition, depending on many factors, like if an infant is sick and their age.

Breastfeeding duration seemed like it may be negatively associated with cortisol in school age children in one study[2]. If that's the case, the best thing a mother in a stressful environment can do is breastfeed.

1. https://pubmed.ncbi.nlm.nih.gov/33017792/ 2. https://www.researchgate.net/publication/355137223_Breastfee...