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.
Q: When is a baby officially considered premature? A: Although pregnancy is generally 40 weeks long, babies born at 37 weeks are considered full-term (at that point, they're developed enough that they shouldn't have any age-related health issues). Any child born 36 weeks or earlier is considered a preemie, but these days neonatal care is so outstanding that even babies born as early as 32 weeks recover very well with minimal developmental issues.