The 24/7 Baby Doctor is a 21st century reference guide for new parents, and coaches readers in an encouraging, you-can-do-this voice telling parents what they can do and when they need to consult their doctor. Topics include: sleep, food, crying, stooling, spitting up, development, health and safety, and technology. Offered are evidence-based solutions that reflect American Academy of Pediatrics recommendations and the latest research — whether on vaccines, autism, or cognitive products that supposedly make babies smarter. McEvoy is an assistant professor of pediatrics at Harvard Medical School and chief of pediatrics at Massachusetts General West Medical Group, in Boston.