The brain grows rapidly during the last trimester of pregnancy and first 2 years of life. A primary fat in the nerve cells of fetal and infant brains is DHA, or docosahexaenoic acid. DHA belongs to the family of Omega-3 fatty acids, which must be obtained through diet. After birth, DHA can be provided through breast milk, but levels are contingent upon the mother's diet. To learn more about Omega-3s, click here.

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Want to know how to look marvelous without splurging so much? Dr. Oz invites three beauty experts to share the smartest ways to save money while looking fabulous starting from your hair and makeup tools to the beauty products you use.