To draw blood, a needle is inserted beneath the skin. Regardless of the amount of pain, infants will usually cry.
Update Date 5/16/2012
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.