How long does crack stay in a fetus system?

If you smoke crack on a regular basis then the effects will stay with the child untill either a miscarridge or it is born. If the child does come out it and you still smoke then the baby will be need to be put on something to keep the cravings away. If you smoked crack once then the fetus will have it in its system between 3 days to 2 weeks depending on your usage.