Any substance that a mother ingests will go through into her breast milk in varying degrees.
Substances from the environment, a mother inhales is also present.
There has been little known about this until a recent study published 2011 by the Norwegian Institute of Public Health, found that the levels of environmental contaminants decrease during breastfeeding.
The study found that after one year of breastfeeding the contaminants drop by 15-94%.
Most of the contaminants found in breastmilk during the study were from food sources.
Norway has a highest global rate of breastfeeding with 80% of babies’ breastfed at 6 months.
Environmental Contaminants in Breast Milk Decrease Over Lactation