Infant

A newborn infant, seconds after delivery. Amniotic fluid glistens on her skin, and the umbilical cord is still attached.
A crying newborn, a few days after birth
A yawning infant
Eight-month-old sororal twin sisters
Eight-month-old infant; as a common feature, eyes are usually large in relation to the face.
A newborn baby in Indonesia, with umbilical cord ready to be clamped
Infants sleeping at the maternity hospital in Kotka, Finland in the 1950s
Nine-month infant playing with plastic duck toys, 1970
A mother wishes joy towards her child in William Blake's poem "Infant Joy". This copy, Copy AA, was printed and painted in 1826, is currently held by the Fitzwilliam Museum.
An infant being immunized in Bangladesh
An East Asian baby
An African baby
An African baby born to two African parents, with an unusually light skin
An Indian baby
Infant in Zimbabwe

Formal or specialised synonym for the common term baby, meaning the very young offspring of human beings.

- Infant

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Birth weight

Baby weighed as appropriate for gestational age.
Relation of weight and gestational age.
Poster from the Soviet Union encouraging mothers to weigh their babies every week. (1930)

Birth weight is the body weight of a baby at its birth.

Infant formula

Infant formula
An infant being fed from a baby bottle
Poster advertisement for Nestle's Milk by Théophile Alexandre Steinlen, 1895
A 1915 advertisement for "Nestlé's Food"

Infant formula, baby formula or just formula (American English) or baby milk, infant milk, false milk, or first milk (British English), is a manufactured food designed and marketed for feeding to babies and infants under 12 months of age, usually prepared for bottle-feeding or cup-feeding from powder (mixed with water) or liquid (with or without additional water).

Preterm birth

Intubated preterm baby in an incubator
A new mother holds her premature baby at Kapiolani Medical Center NICU in Honolulu, Hawaii
Percentage premature births in England and Wales 2011, by age of mother and whether single or multiple birth.
Stages in prenatal development, with weeks and months numbered from last menstruation
Preterm birth at 32 weeks and 4 days with a weight of 2,000 g attached to medical equipment
Incubator for preterm baby
Preterm infants survival rates

Preterm birth, also known as premature birth, is the birth of a baby at fewer than 37 weeks gestational age, as opposed to full-term delivery at approximately 40 weeks.

Fontanelle

The skull at birth, showing the anterior and posterior fontanelles
Anterior fontanelle of a 1-month-old infant
Fontanelle.
Anterior fontanelle.
Cranial sutures shown from top of head.
infant skull.

A fontanelle (or fontanel) (colloquially, soft spot) is an anatomical feature of the infant human skull comprising soft membranous gaps (sutures) between the cranial bones that make up the calvaria of a fetus or an infant.

Umbilical cord

Conduit between the developing embryo or fetus and the placenta.

Umbilical cord of a three-minute-old baby. A medical clamp has been applied.
Cross section of the umbilical cord.
Vaginal ultrasonography of an embryo of a gestational age of 8 weeks and 3 days. The embryo is surrounded by the thin membranes of the amniotic sac, the umbilical cord is seen in the center, attaching the embryo to the placenta.
A knotted cord on a newborn baby
The umbilical cord is about to be cut with scissors via cesarean section
Umbilical cord clamp
A day-old baby with its cord stump still attached.
A 7 cm (2.75 in) long detached umbilical cord.
Sectional plan of the gravid uterus in the third and fourth month.
Fetus in utero, between fifth and sixth months.
A newborn at 45 seconds, with umbilical cord clamped.
Umbilic. Deep dissection. Serial cross section.
dried umbilical cord stump.

The umbilical cord in a full term neonate is usually about 50 centimeters (20 in) long and about 2 centimeters (0.75 in) in diameter.

Fetus

Unborn offspring that develops from an animal embryo.

A human fetus, attached to placenta, at three months gestational age.
Diagram of the human fetal circulatory system.
Fourteen phases of elephant development before birth
Fetal stage of a porpoise
3D ultrasound of {{convert|3|in|mm|-1|adj=on|order=flip}} fetus (about {{frac|3|1|2}} months gestational age)
Fetus at {{frac|4|1|4}} months
Fetus at 5 months

When such premature babies are born, the main causes of mortality are that the respiratory system and the central nervous system are not completely differentiated.

Diaper

Type of underwear that allows the wearer to urinate or defecate without using a toilet, by absorbing or containing waste products to prevent soiling of outer clothing or the external environment.

Inside of a disposable baby diaper with resealable tapes and elasticated leg cuffs
Different kinds of outer diapers
Diapers on a shelf
Unpleasant duties (1631) by Adriaen Brouwer, depicting the changing of a diaper
A baby wearing a disposable diaper
Cloth diaper filled with extra cloth
Baby with cloth diaper
Safe Diaper Clip from the mid-1960s
Adult diapers may be worn for urinary and fecal incontinence.

Diapers are primarily worn by infants, toddlers who are not yet toilet trained, and by children who experience bedwetting.

Pediatrics

A pediatrician examines a newborn.
Part of Great Ormond Street Hospital in London, United Kingdom, which was the first pediatric hospital in the English-speaking world.

Pediatrics (also spelled paediatrics or pædiatrics) is the branch of medicine that involves the medical care of infants, children, and adolescents.

Milk

Nutrient-rich liquid food produced by the mammary glands of mammals.

A glass of cow milk
Cows in a rotary milking parlor
Breastfeeding to provide a mother's milk
A goat kid feeding on its mother's milk
The Holstein Friesian cow is the dominant breed in industrialized dairy farms today
A bowl of milk for the shaman rite; Buryatia, Russia
Drinking milk in Germany in 1932
Preserved Express Dairies three-axle milk tank wagon at the Didcot Railway Centre, based on an SR chassis
Milk transportation in Salem, Tamil Nadu
Industralized milk.
Modern dairy farm in Norway
Butterfat is a triglyceride (fat) formed from fatty acids such as myristic, palmitic, and oleic acids.
A simplified representation of a lactose molecule being broken down into glucose (2) and galactose (1)
Milk products and productions relationships (click to enlarge)
A milking machine in action
Glass milk bottle used for home delivery service in the UK
Returning reusable glass milk bottles, used for home delivery service in the UK
Vendors in Amritsar,India transporting milk in gagar, 2019
Milk in different packets
Four liter bagged milk in Quebec, Canada
The milk section in a Swedish grocery store
A primary school child in England drinking milk out of a glass bottle with a straw
A glass bottle of non-homogenized, organic, local milk from the US state of California. American milk bottles are generally rectangular in shape.
A rectangular milk jug design used by Costco and Sam's Club stores in the United States which allows for stacking and display of filled containers rather than being shipped to the store in milk crates and manual loading into a freezer display rack
Yakult, a probiotic milk-like product made by fermenting a mixture of skimmed milk with a special strain of the bacterium Lactobacillus casei Shirota
Gourd used by Kalenjins to prepare a local version of fermented milk called mursik
Steamed milk is used in a variety of espresso-based coffee beverages.
Hindu Abhisheka ritual in Agara, Bangalore Rural District, Karnataka
A milk and rose-petal bath at a spa in Thailand

In almost all mammals, milk is fed to infants through breastfeeding, either directly or by expressing the milk to be stored and consumed later.

Nipple

Raised region of tissue on the surface of the breast from which, in females, milk leaves the breast through the lactiferous ducts to feed an infant.

A nipple, areola and breast of a female human
A human male nipple
Infant latched on to nipple.
Silicone teat or nipple, used for bottle feeding.
Duplessis's portrait of a semi-topless Marie Thérèse Louise of Savoy dates from 18th-century France.
A Namibian woman

The physiological purpose of nipples is to deliver milk, produced in the female mammary glands during lactation, to an infant.