Researchers did not observe the same correlation among daughters.
A second look at CDC data shows that racial disparity in health starts in the earliest days of life.
The advice is part of booklet called Mother and Child Care, put together by a body promoting yoga and naturopathy.
Two out of every three maternal deaths occur in Sub-Saharan Africa.
Barbara Bush and Melinda Gates described the impact of the Ebola outbreak on women's health.
Campaign aims to eliminate maternal deaths with the 'Mum's Phone'