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Why Is Baby’s Head So Big in the Sonogram?

Whoa! My baby’s head looks huge in the sonogram. Why is that?
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profile picture of Stuart Fischbein, MD
Updated
February 28, 2017
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Nope, it’s not an optical illusion. Your baby’s head really is big in proportion to his body right now.

At 11 weeks of pregnancy, baby’s head is about half the length of his body. Gradually, the body lengthens out and by about 28 weeks of pregnancy, baby’s body and head look a whole lot closer to normal. But it still won’t be in the same proportion as your head is to your body. At birth, a baby’s head is typically about one-fourth of his body length. Yours is just one-seventh of your height.

No wonder babies seem so top-heavy!

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Please note: The Bump and the materials and information it contains are not intended to, and do not constitute, medical or other health advice or diagnosis and should not be used as such. You should always consult with a qualified physician or health professional about your specific circumstances.

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