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How do doctors measure a baby's development?

Dr. Michael Roizen, MD
Internal Medicine
All ages are based on clinical age; that's two weeks from the last day of your last period. That's what most docs use, because it's easier to track than gestational age—they weren't there for fertilization, after all. Many pregnancy references use gestational age (which you get by subtracting two weeks from clinical age), so just be in tune to which number is being used if you're trying to track milestones, tests, and the like.
YOU: Having a Baby: The Owner's Manual to a Happy and Healthy Pregnancy

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YOU: Having a Baby: The Owner's Manual to a Happy and Healthy Pregnancy

Can I get a cavity filled while pregnant? Will avoiding spicy foods make my kid a picky eater? Can I really increase my baby's IQ while she's in utero? Whether you're pregnant for the first time,...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.