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At 18 weeks, a fetus is anywhere from 5 to 10 inches long (the average length is 5.59 inches) and weighs between 6 oz. and 1 lb. (6.7 oz. is the average). Tooth buds are developing and sweat glands are forming on the palms and soles. Fingers and toes are well defined. The fetus develops reflexes such as sucking and swallowing.
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