Does weed affect breast milk?

Infants exposed to marijuana via breast milk will test positive in urine screens for long periods (2-3 weeks). One study (Astley and Little, 1990) found that exposure to marijuana through their mother’s milk during the first month of life resulted in decreased motor development at one year of age. read more

However, the amount of THC that's transferred to the baby through breast-feeding is not enough to produce a high, Lasley said. There is also some concern that smoking marijuana can lower women's levels of prolactin, the hormone needed for breast-milk production, Lasley said. read more