A single parent usually refers to a parent who has most of the day to day responsibilities in the raising of the child or children, which would categorize them as the dominant caregiver who is not living with a spouse or partner, or those who are not married. The dominant caregiver is the parent in which the children have residency with the majority of the time; if the parents are separated or divorced children live with their custodial parent and have visitation with their noncustodial parent. In western society in general, following separation, a child will end up with the primary caregiver, usually the mother, and a secondary caregiver, usually the father.

Historically death of a partner was a major cause of single parenting. Single parenting can result from separation or divorce of a couple with children. Custody battles, awarded by the court or rationalized in other terms, determine who the child will spend majority of their time with, this affects children in many ways and there are many suggestions to counsel them. A mother is typically the primary caregiver in a single parent family structure as a result of divorce, unplanned pregnancy. Fathers have been less commonly primary caregiver in the past, presumably due to assumptions that a child from two separate parents is better off with the mother than the father, but this scenario has shifted in recent years. Single parent adoption is sometimes an option for adults who want children but do not have a partner.

An infant (from the Latin word infans, meaning "unable to speak" or "speechless") is the very young offspring of a human or other mammal. When applied to humans, the term is usually considered synonymous with baby, but the latter is commonly applied to the young of any animal. When a human child learns to walk, the term toddler may be used instead.

The term infant is typically applied to young children between the ages of 1 month and 12 months; however, definitions vary between birth and 3 years of age. A newborn is an infant who is only hours, days, or up to a few weeks old. In medical contexts, newborn or neonate (from Latin, neonatus, newborn) refers to an infant in the first 28 days after birth; the term applies to premature infants, postmature infants, and full term infants. Before birth, the term fetus is used.

Infant is also a legal term referring to any child under the age of legal adulthood.

A newborn's shoulders and hips are wide, the abdomen protrudes slightly, and the arms and legs are relatively long with respect to the rest of their body. In first world nations, the average birth weight of a full-term newborn is approximately 3.2 kg.(7 ½ lbs), and is typically in the range of 2.7–4.6 kg (5.5–10 pounds). The average total body length is 35.6–50.8 cm (14–20 inches), although premature newborns may be much smaller. The Apgar score is a measure of a newborn's transition from the uterus during the first minutes after birth.

Data ( /ˈdeɪtə/ DAY-tə, /ˈdætə/ DA-tə, or /ˈdɑːtə/ DAH-tə) are values of qualitative or quantitative variables, belonging to a set of items. Data in computing (or data processing) are often represented by a combination of items organized in rows and multiple variables organized in columns. Data are typically the results of measurements and can be visualised using graphs or images. Data as an abstract concept can be viewed as the lowest level of abstraction from which information and then knowledge are derived. Raw data, i.e., unprocessed data, refers to a collection of numbers, characters and is a relative term; data processing commonly occurs by stages, and the "processed data" from one stage may be considered the "raw data" of the next. Field data refers to raw data collected in an uncontrolled in situ environment. Experimental data refers to data generated within the context of a scientific investigation by observation and recording.

The word data is the plural of datum, neuter past participle of the Latin dare, "to give", hence "something given". In discussions of problems in geometry, mathematics, engineering, and so on, the terms givens and data are used interchangeably. Such usage is the origin of data as a concept in computer science or data processing: data are numbers, words, images, etc., accepted as they stand.