second trimester
first trimester
third trimester
postterm
labour
premature
perigestational
midgestation
premature labor
full term
term
premature labour
prematurely
near-term
rhythm
rhythm method
rhythm method of birth control
calendar method
calendar method of birth control
midterm
fertile period
birthtide
fertile phase
fourth trimester
preovulation
due date
parity
prebirth
gestation period
gestation
monther
peripregnancy
fertilization age
fetal age
progestational
gestational age
postneonatal
intermonthly
premature baby
preterm infant
preemie
week
premature infant
premie
preterm baby
fetus
midpregnancy
expected date of confinement
toddlerdom
neonatality