To draw blood, a needle is inserted beneath the skin. Regardless of the amount of pain, infants will usually cry.
Review Date 5/20/2018
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.