A mother's right to consume alcohol or other harmful substances ends at the placental wall. If the baby is going to be carried to term, then the rights of the baby exceed those of the mother. Many more will have consumed alcohol during the first two or three months before they discovered they were pregnant. The baby may have already been damaged. Continued drinking would exacerbate the problem.
Research shows that alcohol damage to the fetus occurs over a wide continuum.
Damage varies due to volume ingested, timing during pregnancy, peak blood alcohol levels, genetics and environmental factors. Consider the future for a victim of fetal alcohol. The child may be rather bright but not be able to retain information. There may be other learning disabilities. Children and some teachers can be very cruel.