how do drugs affect unborn babies?

Question: how do drugs affect unborn babies?

Asked by elliesmelly to Sarah on 21 Jun 2010 in Categories: General.
- Sarah Bardsley answered on 21 Jun 2010:
  
  An unborn baby is connected to its mother via the placenta. Any drug that the mother takes will cross this organ and enter the baby’s blood stream. Because the baby is so small and undeveloped, the effects will be magnified. What those effects are will depend on the drug and its characteristics.

Question: how do drugs affect unborn babies?