So the problem with cocaine is that it can easily cross across that placental membrane and so that cocaine that damages that mother also ends up damaging that fetus. The problem is the mother is already fully developed so the cocaine actually amplifies the damage on that fetus because the fetus is still in its developmental stage. So cocaine basically leads to different types of physical deformities. It can also lead to mental deformities as well. So what do we mean by physical deformities? Well, for example, fetuses that are born to mothers who use cocaine have a smaller head.