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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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Whoa! My baby’s head looks huge in the sonogram. Why is that?

The Bump Expert

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!

More from The Bump:

Find out how big baby is this week!

Your Guide to Prenatal Tests

How the Doctor Estimates Baby's Weight Before Birth

Stuart Fischbein, MD, ob-gyn and co-author of Fearless Pregnancy: Wisdom and Reassurance from the Doctor, a Midwife, and a Mom.