The belly at 14 weeks pregnant varies in size depending on the woman, but the fetus is approximately the size of a lemon, according to The Bump. The fetus is roughly 3.4 inches long and weighs about 1.5 ounces.
Week 14 is considered the second trimester of pregnancy, in which the size of the baby and mother increases. Many women report having to purchase maternity clothes at this point in pregnancy, according to The Bump. It is recommended that the mother-to-be consumes an additional 300 to 500 calories each day to gain 1/2 to 1 pound per week, suggests WebMD.