Marijuana has had a variety of studies in pregnancy and results are conflicting. Certainly smoking or ingesting a large amount can be harmful for baby. People often use marijuana to cope with stress or other situations. Pregnancy is a good time to try using other tools to manage this. Once the baby comes you need to ensure the marijuana does not affect your ability to care for your baby. Additionally, toddlers put everything in their mouths and a few have been known to eat the butts of joints and cigarettes and become comatose. So always be careful to dispose of things and keep out of reach of young children.