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embryo - conceptus between time of fertilization to 10 weeks of gestation

FASD - Fetal Alcohol Spectrum Disorder, a clinical term for the effects alcohol can have on the developing fetus

fetus - from 10 weeks of gestation to time of birth

Ga Pw-x-y-z - a = number of pregnancies, w = number of term births, x = number of preterm births, y = number of miscarriages, z = number of living children; for example, G4P1-2-1-3 means the woman had a total of 4 pregnancies, of which 1 is of term, 2 are preterm, 1 miscarriage, and 3 total living children (1 term + 2 preterm).

Gestational age - time from last menstrual period (LMP) up to present

gravidity (G) - number of times a woman has been pregnant

infant - time of birth to 1 year of age

parity (P) - number of pregnancies with a birth beyond 20 weeks GA or an infant weighing more than 500 g

preterm infant - delivered between 24-37 weeks

previable infant - delivered prior to 24 weeks

term infant - delivered between 37-42 weeks

first trimester - up to 14 weeks of gestation

second trimester - 14 to 28 weeks of gestation

third trimester - 28th week to delivery

viability - minimum age for fetus survival, ca. third trimester

zygote - from fertilization until second cell division

full term refers to the end of 36 weeks (nine months) from the first day of the mother's last menstrual period — the end of gestation. If a woman gives birth earlier than this, it is classed as a premature birth.