Approximately Correct Measurements and Weight of Fetus at End of Each Month of Pregnancy.
Men and women are always interested to know how large the fetus is and how far it is developed during the various months of pregnancy. Absolutely exact measurements cannot be given, but the following approximate measurements are correct:
1. Embryo Between One and Two Weeks Old.
2. Embryo About Four Weeks Old.
3. Embryo About Six Weeks Old.
At the end of the first month (lunar) it is about the size of a hazelnut. Weighs about 15 grains.
At the end of the second month it is the size of a small hen's egg. The internal organs are partially formed, it begins to assume a human shape, but the sex cannot yet be differentiated. Up to the fifth or sixth week it does not differ much in appearance from the embryos of other animals.
At the end of the third month it is the size of a large goose egg; it is about two to three and a half inches long. Weighs about one ounce.
At the end of the fourth month the fetus is between six and seven inches long and weighs about five ounces.
At the end of the fifth month the fetus is between seven and eleven inches long, and weighs eight to ten ounces.
At the end of the sixth month it is eleven to thirteen inches long and weighs one and one-half to two pounds. If born, is capable of living a few minutes, and it is reported that some six months' children have been incubated.