I was first told that my aorta is slightly dilated at 4.0 cm. There is some variation in the way the term aneurysm is used. For the thoracic aorta, most agree that at a diameter of 4.0 cm it has reached a size that is considered an aneurysm. The word dilated refers to the enlargement of the aorta.
Called also neonate and newborn. premature infant (preterm infant) one born before a gestational age of 37 completed weeks (259 days). The duration of gestation is measured from the first day of the last menstrual period and is expressed in completed days or weeks.
In light of recent research showing that each week of gestation affects newborn health, a leading doctors' group is redefining when a pregnancy is considered term.. Previously, a pregnancy was considered full term any time between 37 and 42 weeks of gestation.On average, a single-fetus pregnancy lasts 40 weeks from the date of the woman's last menstrual period.Fewer moms having C-sections before 39 weeks.nder the new definitions, the period between 37 weeks and 38 weeks, six days of gestation is considered early term.. Thirty-nine weeks to 40 weeks, six days is considered full term; between 41 weeks 0 days and 41 weeks, six days is late term; and 42 weeks and beyond is considered postterm..