Yes, says new research. But the exact consequences of the small amount of marijuana that makes it to a baby aren't yet clear. The researchers also don't know if the levels of pot in breast milk would rise if a woman smokes more. Still, study co-author Dr. There's concern for the developing brain exposed to THC [the active component in marijuana].
Abstract AIMS To investigate the transfer of amphetamines into breast milk following their recreational use and estimate drug exposure for the breastfed infant. A urine sample was collected 4 h after dose, and milk samples were collected over 24 h. Drug in urine was qualitatively identified by gas chromatography-mass spectrometry and quantification in milk was by high-performance liquid chromatography. Absolute infant dose via milk was estimated. Absolute infant doses for methylamphetamine plus amphetamine as methylamphetamine equivalents were
Abstract Question If a mother takes a sedating drug during breastfeeding, will it cause central nervous system CNS depression in her breastfed baby? Answer In some cases eg, with the use of codeine or oxycodone sedating drugs will likely cause CNS depression in breastfed infants and in other cases eg, with the use of benzodiazepines they will likely not. Mothers using sedating drugs should monitor their breastfed infants for signs of CNS depression eg, drowsiness; difficulty breathing, feeding, or latching; or cyanosis , paradoxical effects eg, unusual excitement, irritability , or inadequate weight gain.