Miscarriage - The natural end of a pregnancy at a stage
where the baby (embryo or fetus) dies at a gestation of prior to 20 weeks. (Some definitions extend miscarriage
until the 27th week.)
Stillbirth -
The natural end of a pregnancy at a stage where the baby (fetus) dies at a gestation of 20 weeks or greater.
(Some definitions postpone stillbirth until the 28th week.)
Embryo - An unborn baby prior to 8 weeks after conception.
Fetus - An unborn baby between
8 weeks after conception and birth.
Amniotic
Fluid - The fluid surrounding the baby in the womb.
Gestational Age - The age of the baby from the first day of the woman's
last menstrual period. Gestational age is usually greater than conception age by two weeks.
Conception Age - The age of the baby from the date of conception
or fertilization.
First Trimester
- Conception through 13 weeks of gestation.
Second Trimester - 14 weeks through 26 weeks of gestation.
Third Trimester - 27 weeks
through 40 weeks of gestation.
