From early in pregnancy, babies grow at different rates, so these numbers are merely averages. Your baby's actual length and weight may vary substantially.
Don't worry too much if an ultrasound indicates that your baby is much smaller or larger. (Your practitioner will let you know if it's time to worry about how big your baby is.) By full-term, your baby may end up weighing less than 5 pounds or more than 9.
Until about 20 weeks, babies are measured from the crown (or top) of the head to the rump (or bottom). This is because a baby's legs are curled up against his torso during the first half of pregnancy and very hard to measure.
After that, babies are measured from head to toe.
See our pregnancy timing article to learn how the weeks of pregnancy are counted and your baby's gestational age is determined.
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