Hello dear future mother! Yes, smoking marijuana during pregnancy may affect your baby’s growth and the development of his/her nervous system. In general, children who were exposed to marijuana during pregnancy may have problems with short term memory, concentration, judgment, and may have problems focusing their attention and solving their problems. Marijuana is not safe in pregnancy. If you smoke marijuana and breastfeed, the active chemical in marijuana is passed to your baby through milk. I would advice a nursing mom to abstain from marijuana while breastfeeding. I suggest you to talk to your doctor for other treatment options for your nausea and hurt burn during pregnancy. I hope I answered your question. Have a safe and wonderful pregnancy!