nasc-, nat-

First to learn the nature of things.

Another version is "Above all to find out the way things are." A motto of the Australian National University, Canberra, Australia.

1. The natural world as it exists without human beings or civilization.
2. The elements of the natural world; such as, mountains, trees, animals, or rivers.
3. The forces and processes that produce and control all the phenomena of the material world.
4. The world of living things and the outdoors; for example, "the beauties of nature".

A drugless system of therapy, making use of physical forces such as air, light, water, heat, massage, etc.

1. Concerning the first 28 days after the birth of a child.
2. Referring to, or pertaining to, newborn infants.

1. A newborn infant up to one month of age.
2. An infant during the first four weeks of life.

A reference to the newborn.

Although the first 28 days of life comprise the usual period designating a neonate or newborn, for statistical purposes, some have reckoned the period as applying to the first seven days.

The term early neonatus has been used to describe the first week of life.

We are not born for ourselves.

1. Occurring during or pertaining to the phase surrounding the time of birth, from the twentieth week of gestation to the twenty-eighth day of newborn life.
2. A reference to the period immediately before and after birth.

The perinatal period is defined in various ways: Depending on the definition, it starts at the 20th to 28th week of gestation and ends one to four weeks after birth.

The word "perinatal" is a hybrid of the Greek "peri-" meaning "around or about" and "natal" from the Latin "natus" meaning "born."

1. An obstetrician specializing in perinatology.
2. An obstetrical subspecialist concerned with the care of the mother and fetus at higher-than-normal risk for complications.

A perinatologist logically could be an obstetrician or pediatrician but, in practice, a perinatologist is an obstetrician.

The comparable area of pediatrics is neonatology. A high-risk baby might be cared for by a perinatologist before birth and by a neonatologist after birth.