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Gestational age: 4 weeks and 0 days until 4 weeks and 6 days old. 29–35 days from last menstruation. Embryonic age: Week nr 3. 2 weeks old. 15–21 days from fertilization. A notochord forms in the center of the embryonic disk. (day 16 of fertilization. [1]) Gastrulation commences. (day 16 of fertilization. [1])
The Bayley Scales of Infant and Toddler Development (version 4 was released September 2019) is a standard series of measurements originally developed by psychologist Nancy Bayley used primarily to assess the development of infants and toddlers, ages 1–42 months. [1]
Developmental milestones [3] [4] Age Motor Speech Vision and hearing Social 1–1.5 months When held upright, holds head erect and steady. Cooes and babbles at parents and people they know Focuses on parents. Loves looking at new faces; Starts to smile at parents; Startled by sudden noises; Recognition of familiar individuals; 1.6–2 months
Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood. [1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age.
Newmeyer suggests parents download the CDC's free milestone tracker app, which can help parents keep tabs on their child's development from ages 2 months through 5 years old.
The speed of physical growth is rapid in the months after birth, then slows, so birth weight is doubled in the first four months, tripled by 1 year, but not quadrupled until 2 years. [85] Growth then proceeds at a slow rate until a period of rapid growth occurs shortly before puberty (between about 9 and 15 years of age). [86]
The Rourke Baby Record is a pediatric record widely used in Canada, and provides practice guidelines to physicians for the care of Canadian neonates, infants and toddlers. "The Rourke", as it is called among Canadian family physicians and pediatricians, is published by the Canadian Pediatric Society, and is intended for general use with patients ages 0–5 years. [1]
Different terms are used to describe prenatal development, meaning development before birth. A term with the same meaning is the "antepartum" (from Latin ante "before" and parere "to give birth") Sometimes "antepartum" is however used to denote the period between the 24th/26th week of gestational age until birth, for example in antepartum ...