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| |    Fetal Lengths and Weights at Different Gestations by Lisa Rodriguez, R.N. and Marjorie Greenfield, M.D. reviewed by Marjorie Greenfield, M.D. Have you wondered at different times how big your baby is as she grows inside you? Is she the size of a walnut, a tennis ball, a cantaloupe? Well, for those of you who are curious, here is a list of the average sizes and shapes of fetuses as they progress through their growth. You may notice that for the first several months of pregnancy, the lengths are given in crown-to-rump measurements (that is, from the crown of the head to the buttocks). This is because it's difficult to get a head-to-toe measurement in the first few months, when the fetus typically lies in a curled position. 1 month (6 weeks) Your baby's length is about 1/10 of an inch. She is too small for your practitioner to measure her weight at this time. 2 months (10 weeks) Your baby is about 1¼ inches long, crown to rump, and weighs about 1/3 ounce. This is about the size of a golf ball. 3 months (14 weeks) She measures about 2¾ to 4 inches, crown to rump, and weighs about an ounce. She is now roughly the size of your fist. 4 months (18 weeks) Your baby is around 5 to 5½ inches, from her crown to her rump, and weighs about 5½ ounces. 5 months (22 weeks) By this time, she's a good 7 to 10 inches long (total body length), weighing between half a pound and 1 pound. She is about the size of a large banana. 6 months (26 weeks) Your bundle-of-joy should be about 11 to 14 inches long and weigh approximately 1½ to 2 pounds. 7 months (30 weeks) At this point, your baby probably measures about 17 inches and weigh about 3 pounds. 8 months (34 weeks) Your baby is likely to be about 18 to 20 inches long, weighing between 4 and 5½ pounds. 9 months (38 to 41 weeks) At term, the average baby is 18 to 21inches long. She'll weigh about 7 to 7½ pounds at birth.
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