Newborn
According to the World Health Organization (WHO), the newborn phase begins once the baby is born and lasts for the first 28 days of life. Some believe that the newborn phase starts once the baby is born through the first 8 weeks. Many medical experts consider the newborn stage to be the baby’s first 12 weeks of life.
Premature
Babies born early are considered premature because they are born prior to 37th week of pregnancy. Babies are born early for several reasons including diabetes, high blood pressure, or genetics.
What is the infant age range?
A baby is an infant through their first year of life, from birth to 1 year. There is overlap between the terms “newborn” and “infant” since infancy includes the newborn phase.During the first three months of a baby’s life, the terms “newborn” and “infant” can be used to describe a baby, and you might even hear the term “newborn infant.”