Word parts
tri- threemens month
What it means
Pregnancy is about 40 weeks counted from the first day of the last menstrual period. The first trimester runs to the end of week 13, when the organs form; the second from week 14 through week 27; and the third from week 28 until birth. Each brings its own body changes, tests and teaching.
At a glance
| Spanish | trimestre |
|---|---|
| Also written | trimesters |