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.
40 weeks is about 9 months and 1 week (9.2 months). Actual gestation (from conception to birth) is just under 9 months. Whether or not a baby is premature depends more on its size and weight than how many weeks along the mother is in the pregnancy. When referring to length of pregnancy, if a baby comes early (generally before about 36 weeks) it is best referred to as pre-term. This means that a baby could be pre-term but not premature.