In the Awake-alert state, infants are fairly inactive but attentive to the environment.
The phrase "infant" is a formal or specific synonym for the term "baby," which is used to describe the very young children of humans.
The Latin term infants, which meaning "unable to talk" or "speechless," is where the name infant originates.
This term may also be used to describe the young of other creatures. An infant that is just a few hours, days, or even a few weeks old is referred to as a newborn in everyday conversation. In medical contexts, an infant within the first 28 days following delivery is referred to as a "newborn" or "neonatal," which includes preterm, full-term, and postmature newborns.
A fetus is a living being that has not yet given birth.
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