Media reports have highlighted the plight of mothers, fathers and caregivers across the U.S. who have scrambled to find scarce supplies, or driven long distances to buy formula. But what is behind the shortage? And how can it be prevented from happening again? Dr. Steven Abrams, a leading expert on pediatric health at the University of Texas who has advised both the formula industry and government on infant nutrition, answers 6 questions and offers advice for parents.