Neonate

n. baby; newborn infant; infant in the first month of life

In basic English usage, an infant is defined as a human child at the youngest stage of life, specifically before they can walk and generally before the age of one (see also child and adolescent).The term "infant" derives from the Latin word in-fans, meaning "unable to speak." There is no exact definition for infancy. "Infant" is also a legal term with the meaning of minor; that is, any child under the age of legal adulthood.A human infant less than a month old is a newborn infant or a neonate. The term "newborn" includes premature infants, postmature infants and full term newborns.
See more at Wikipedia.org...

Neonate /neo·nate/ newborn infant. ne·o·nate n. A neonatal infant. neonate a newborn animal. The duration of the state of neonaticity varies between [more]Neonate - Community and Resources

Noun
1. a baby from birth to four weeks
(synonym) newborn, newborn infant, newborn baby
(hypernym) baby, babe, infant
(hyponym) liveborn infant

adj. newborn

n. baby, infant