evidence: While breastfeeding, it is important to know that breastmilk can contain THC for up to six days after use. This THC may affect a newborn’s brain development and result in hyperactivity, poor cognitive function, and other long-term consequences. [...] We especially want to learn more about the effects of CBD during pregnancy and while breastfeeding, including, for example, whether and to what extent the presence of CBD in human milk harms the breastfed baby or the mother’s milk production. [...] - FDA strongly advises that during pregnancy and while breastfeeding, you avoid using CBD, THC, or marijuana in any form.