Montgomery-Downs and her colleagues noted that the findings may not be generalizable to mothers with a history of depression or anxiety, because such women were excluded from the study cohort.
"This is important," the authors wrote, "because women who are depressed are less likely to continue breastfeeding."
Additionally, they wrote, the study may have been biased because women who could not be contacted for the study were younger, had less education, had lower incomes, and were less likely to breastfeed.
The study was funded by a grant from the NIH.
The authors reported that they had no conflicts of interest.