There isn't a strict or universally defined age limit for the term 'baby.' To provide a general breakdown of children's age ranges, a child up to 2 months is considered a newborn, up to 1 year is referred to as an infant, and from 1 to 3 years is typically described as a toddler. Beyond the age of 3, a child is often categorized as a preschooler.

A quick recap: a newborn is a baby aged 0-2 months of age, an infant is a child aged 0-12 months and a toddler refers to a child aged 1-3 years of age. The term ‘baby’ is an umbrella term and refers to a child aged 0 to 4 years old.

While people usually refer to babies as newborns up to one or two months of age, the definition of a newborn or a neonate is a baby who is not older than 28 days. After that point, a baby is referred to as an infant until 12 months of age.

The main difference between newborns and infants lies in their newborn age. A newborn typically refers to a baby from birth to about two months old, whereas an infant encompasses the broader age range from birth to one year old.

An infant is a child between birth and 12 months old, while a neonate is a newborn baby, specifically one who is 28 days of age or younger.