Leana Wen, MD, emergency physician, professor at George Washington University, contributing columnist for The Washington Post, CNN medical analyst, former Baltimore Health Commissioner and the author of Lifelines: A Doctor's Journey in the Fight for Public Health (Metropolitan Books, 2021), explains her view that because new variants are likely to arise, taking advantage of the end of the omicron wave to relax restrictions might make sense -- and talks about the latest developments with a vaccine for kids under 5.