In a study with obese and lean women, Paganos and colleagues investigated the content of omega-3 fatty acids and omega-6 fatty acids in breast milk (Panagos et al., 2016). They found that compared to the breast milk of lean mothers, obese mothers’ breast milk contains more (pro-inflammatory) omega-6 fatty acids and fewer (anti-inflammatory) omega-3 fatty acids. The authors propose that this altered balance between omega-6 and omega-3 fatty acids in obese mothers may have a negative impact on early visual and neural development of the baby.
 
Reference:
Panagos, P. G., Vishwanathan, R., Penfield-Cyr, A., Matthan, N. R., Shivappa, N., Wirth, M. D., Hebert, J. R., & Sen, S. (2016). Breastmilk from obese mothers has pro-inflammatory properties and decreased neuroprotective factors. Journal of Perinatology, 36(4), 284–290. https://doi.org/10.1038/jp.2015.199