third trimester
second trimester
first trimester
labour
parity
full term
monther
fertile phase
fertile period
bimester
midgestation
term
neonate
newborn
preemie
preterm baby
term infant
preterm infant
premature infant
fourth trimester
premature baby
premie
postmaturity
due date
premature labour
calendar
premature labor
Friedman unit
quadrimester
deadline
calendar method of birth control
preovulation
rhythm
rhythm method
calendar method
rhythm method of birth control
diaperhood
semester
prebirth
trimester
puerperium
gestational age
fetal age
fertilization age
polymenorrhea
periovulation
gestation
gestation period
expected date of confinement
premature birth