noun:a very young child, especially one newly or recently born
The baby slept soundly in the crib.
noun:a person who is immature or behaves like a child
Stop acting like a baby just because you didn’t get your way.
verb:to treat someone with excessive care or attention
He tends to baby his younger sister, doing all her chores for her.
adjective:relating to something small, infantile, or designed for infants
Baby carrots are sweeter than mature ones.