Whatever your position is regarding COVID-19 vaccines, it seems these mRNA vaccines are not passed on from mother to infant through breastfeeding.
No Traces in Breast Milk
According to a study at University of California San Francisco, there were no traces of the vaccines in breast milk of mothers who received the mRNA vaccines. The mRNA vaccines were not detectable in any component of the milk.
The breast milk of seven women were analyzed after they received COVID-19 mRNA vaccines. The mRNA vaccines were not detected in the milk samples tested. The average age of the mothers was 37.8 years old. The milk samples from each mother were collected before vaccination, and then at various time points up to 48 hours after vaccination.
Safety of the Child
This study provides experimental evidence that mRNA vaccines against COVID-19 is not detected is not passed on from vaccinated mothers to infants by breast milk. There is little risk of the nanoparticles of a mRNA vaccine entering the breast tissues, or getting transferred to milk. Therefore, the baby should not be affected by the vaccine.
There is one note regarding this study. The study data was limited by the sample size (only seven subjects) so more studies with a larger population of mothers are needed to strengthen the data.
SUMMARY: If you are a pregnant mother, getting vaccinated by a mRNA vaccine will not pass the vaccine to the infant through the breast milk.
This study was published in the July 6, 2021 edition of the journal JAMA Pediatrics.
Evaluation of Messenger RNA From COVID-19 BTN162b2 and mRNA-1273 Vaccines in Human Milk