Wolynn, Evans and Stuebe are all fellows of the physicians' organization Academy of Breastfeeding Medicine (ABM).

CNN: Is the medical community failing breast-feeding moms?

Dr. Amy Evans, a pediatrician and medical director of the Center for Breastfeeding Medicine in Fresno, California, says that as many as 5% of all women have underlying medical conditions that prevent or seriously hinder lactation: hypoplasia, thyroid problems, hormonal imbalances and insufficient glandular tissue, among others.

CNN: Is the medical community failing breast-feeding moms?

"This study goes against everything that's been published for several years now from very reliable clinicians and researchers about the potential hazards of supplementing exclusively breast-feeding babies with formula, " says Dr. Kathleen Marinelli, an associate professor of pediatrics at the University of Connecticut School of Medicine and the chair-elect of the U.S. Breastfeeding Committee.

CNN: How formula could increase breast-feeding rates