The problem only arises when your baby is RH-positive, and you are RH-negative. It is called RH incompatibility, and it can easily cause complications that will affect you and your baby.

A RhoGAM shot is a simple way to prevent complications with your Rh positive baby if you're pregnant and have Rh negative blood. We'll tell you what it does and what to expect.

Clinics that serve autistic children report 62 percent of their patients were born to RH negative moms who received RhoGam. I wish more reporters would cover this.

The mysterious Rh factor-in human blood had disturbed the serenity of many a mother-to-be. For if a wife's blood were Rh negative and a husband's Rh positive, their child might be stillborn, ...

Hematology: Vaccinating the Rh-Negative 2 minute read TIME June 21, 1968 12:00 AM GMT-4 ...