The relationship between the length of the fetus and its age is easily kept in mind with the aid of Haase's rule, viz., during the first five months of gestation the age in months is multiplied by itself, and during the latter half of gestation the age is multiplied by five, the resulting figure being the length of the fetus in centimeters. I have endeavored to formulate a rule which shall furnish an equally easy method for recalling the weight of the fetus at any given age.
According to Roberts,2 the slower growth of the fetal head during the later months of pregnancy is compensated for by the more rapid growth of the limbs; and the formation of dense bony tissue is counterbalanced by the formation of light fatty tissue, the result being that the specific gravity of the fetus is not materially altered, and its volume, and therefore
TUTTLE L. THE RELATION BETWEEN WEIGHT AND AGE IN THE FETUS. JAMA. 1908;LI(11):919–920. doi:10.1001/jama.1908.25410110041002h
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