ESTIMATING FETAL LENGTH: HAASE'S RULE
Full-term newborn's length ranges from 18-22 inches, 19-21 inches or 48-52 cm.
Average length - 50 cm
Formula:
A. From 1-5 lunar months, square the month of pregnancy (to square a number is to multiply it by itself)
(months of pregnancy) x (months of pregnancy) = fetal length
Sample Problem A: how long is a 4-month-old fetus?
Solution..
4 x 4 = 16 cm
Sample Problem B: what is the estimated length of a 3-month-old fetus?
Solution..
3 x 3 = 9 cm
B. From 6-10 lunar months, multiply the month by 5.
(months of pregnancy) x 5 = fetal length
Sample Problem A: How long is a 7-month-old fetus?
Solution..
7 x 5 = 35
Sample Problem B: What is the estimated length of a 10-month-old fetus?
Solution..
10 x 5 = 50 cm
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