Losing a pregnancy or newborn is a grievous experience. Today the perinatal death rate in the U.S.--which refers to fetuses 20 weeks old through babies 4 weeks old--is about 14 per 1,000 births. Many more children die earlier in pregnancy and later in childhood. In Parenthood Lost, Dr. Michael Berman shares his insights from his experiences helping parents deal with their grief and unravels the confusing genetic and medical causes of miscarriage,...