<unk>  is a measure of the<unk>  of a pregnancy which is taken from the beginning of the woman's last menstrual period (LMP), or the corresponding<unk>  of the gestation as estimated by a more accurate method if available. Such methods include adding 14<unk>  to a known duration since fertilization (as is possible in in vitro fertilization), or by obstetric ultrasonography. The popularity of using such a definition of<unk>  is that menstrual periods are essentially always noticed, while there is usually a lack of a convenient way to discern when fertilization occurred. The initiation of pregnancy for the calculation of<unk>  can be different from definitions of initiation of pregnancy in context of the abortion debate or beginning of human personhood.
Gestational age
Metabolic age
Prenatal nutrition
Birth weight
Infant formula
Birthmark
Childbirth positions
Sex after pregnancy