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(4) Alistair Berg/Photodisc
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(7) Dave Nagel/Riser
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Louisiana Department of Health and Hospitals: "Baby Play!"
Altmann, T. Mommy Calls: Dr. Tanya Answers Parents' Top 101 Questions About Babies and Toddlers, American Academy Of Pediatrics, 2009.
White, B. The New First Three Years of Life, 20th Anniversary Edition, Fireside, 1995.
Baby Center: "Play: Why It's So Important," "Let's Play! Inside the Box & Where Did It Go?"
KidsHealth.org: "Learning, Play, and Your 4- to 7-Month Old," "Learning, Play, and Your 1- to 3-Month Old."
Sears, M. The Baby Book: Everything You Need to Know About Your Baby From Birth to Age Two, Little, Brown and Company, 2003.