A baby is a human who is younger than about 1 or 2 years old. Different words are used for a baby at different stages of growth. These words are not used in the same way by everyone. For example, the word infant may be used until a baby can walk, or only until the baby is one year old. Baby is an alternative term for infant. The terms may also be used to refer to juvenile beings of other organisms. The meaning of BABY is an extremely young child; especially : infant —sometimes used of an adult daughter or son to express parental nostalgia or affection. How to use baby in a sentence. UP TO 4K!Official Music Video for Baby performed by Justin Bieber (ft. Ludacris).Follow Justin Instagram: . Start here to learn how to nurture and care for your baby, from feeding and sleep to baby development and behavior, plus baby products that help. (Uh-huh) Said, There's another (Yo), and looked right in my eyes (Uh-huh) My first love broke my heart for the first time, and I was like (Yo, uh-huh) [Chorus: Justin Bieber] Baby, baby. From popular brands like Fisher-Price and Skip Hop, to best-in-class brands like Philips AVENT and Medela, the Amazon Baby Store can be counted on to have options for just about every need. You can also create, find, or manage a Baby Registry. Find baby supplies and essential baby needs at Walmart. Compare diapers, feeding gear, nursery basics, and travel items for every age stage. In addition to breast milk or baby formula, here are solid foods you can introduce to your baby’s diet at each development stage. Explore baby essentials and baby supplies across nursery, feeding, diapering, bath, travel, safety, toys, health and care for newborns and toddlers.