infant

A very young human being, from birth to somewhere between six months and two years of age after birth, needing almost constant care and attention.

A minor.

• Thomas Humphrey Doleman died the 30th of August 1712, an infant, intestate and without issue; Lewis the next nephew died the 17th of April 1716, an infant about sixteen years old, having left his mother Mary Webb, ...

A student in an infant school or the first part of a primary school.CommonwealthIrelandUK

A noble or aristocratic youth.obsolete

• Retourned home, the royall Infant fell / Into her former fitt [...].

Of or pertaining to the earlier half of primary school education.CommonwealthIrelandUK

• Primary schooling in Ireland comprises two Infant years, which are equivalent to pre-school in other countries , and six grades or classes.
• Clearly, from the attention given to it, HMI believed that history should be part of the infant curriculum.

small, being near its source.figurativelynot-comparable

• Leaving Nantyglo, a small station at an altitude of 1,030 ft. with the platform on the eastern side, the train runs northwards over former G.W.R. metals, with the infant River Ebbw, a little more than a yard wide, on the west.

To bear or bring forth (a child); to produce, in general.obsolete

• This worthy motto, "No bishop, no king," is […] infanted out of the same fears.