A newborn or baby is the very young offspring

Offspring

In biology, offspring is the product of reproduction, of a new organism produced by one or more parents.Collective offspring may be known as a brood or progeny in a more general way...

 of a human or other mammal. A newborn is an infant who is within hours, days, or up to a few weeks from birth. In medical contexts, newborn or neonate (from Latin, neonatus, newborn) refers to an infant in the first 28 days after birth. The term "newborn" includes premature

Premature birth

In humans preterm birth refers to the birth of a baby of less than 37 weeks gestational age. The cause for preterm birth is in many situations elusive and unknown; many factors appear to be associated with the development of preterm birth, making the reduction of preterm birth a challenging...

 infants, postmature infants and full term

Full Term

Full Term in the universities of Oxford and Cambridge refers to the eight weeks within the longer academic term during which lectures are given and students are required to be in residence...

 newborns. The term infant is derived from the Latin

Latin

Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 word infans, meaning "unable to speak" or "speechless." It is typically applied to children between the ages of 1 month and 12 months; however, definitions vary between birth and 3 years of age.