Appendix 2
The Development of the Unborn Child's Body

 

Age

 

Timing

 Source
Age is calculated from the first day of the last normal menstrual period (LNMP). This is the menstrual, or gestational, age. The actual age is calculated from the time of fertilization, about two weeks after the LNMP. Two weeks must be subtracted from the gestational age to arrive at the actual age of the developing human.
 Nap Moore, p 2
Ultrasonic tests can determine the size and probable age. Nap Moore, p 109
Menstrual, or gestational, age, is the length of time from the first day of the last menstrual period, a time that precedes conception by about two weeks. Nap Williams, p 151


 


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