How long does cocaine stay in a fetus system?

Hard to say: After the mother uses cocaine, by-products can be found for 30 hours in the urine of the pregnant woman, and for 2-4 days in the newborn. Fetuses are less developed and processing could take longer. If you take cocaine, you are delivering it directly to your baby via your placenta, and you risk fetal loss. Also your baby can be born prematurely, small for gestational age, and with withdrawal.