The stalked barnacle Pollicipes pollicipes (Gmelin, 1789), is a strictly littoral and essentially intertidal pedunculate cirripede that lives by forming dense aggregates or clumps on exposed rocky shores and cliffs associated with a high degree of hydrodynamism (Barnes 1996).
Since some women are unsure of the date of their last menstruation (perhaps due to period irregularities), a baby is considered full term if its birth falls between 37 to 42 weeks of its estimated due date. 1  The unborn baby spends around 37 weeks in the uterus (womb), but the average length of pregnancy, or gestation, is calculated as 40 weeks.
This represents an important change from the old understanding under which pregnancy was considered full term from 37 weeks to 42 weeks. The new set of definitions breaks down like this: Early term: 37 weeks to 38 weeks and 6 days. Full term: 39 weeks to 40 weeks and 6 days. Late term: 41 weeks to 41 weeks and 6 days.