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Embryonic age: Week nr 1. 0 (whole) weeks old. 1–7 days from fertilization. Fertilization of the ovum to form a new human organism, the human zygote. (day 1 of fertilization [1]) The zygote undergoes mitotic cellular divisions, but does not increase in size. This mitosis is also known as cleavage. A hollow cavity forms marking the blastocyst ...
Human embryonic development covers the first eight weeks of development, which have 23 stages, called Carnegie stages. At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs.
The first ten weeks of gestational age is the period of embryogenesis and together with the first three weeks of prenatal development make up the first trimester of pregnancy. From the 10th week of gestation (8th week of development), the developing embryo is called a fetus.
The Synactive Theory of Newborn Behavioral Organization and Development [1] [2] (Synaction n., or Synactive adj. [from the Greek syn “together” and the Latin actio “action,” resulting in: “together in action”]) suggests that development of the human fetus, and later newborn, proceeds through the constant balancing of approach and avoidance behaviors, leading to: (1) a continuous ...
Her breasts may increase in size again by an additional 1 or 2 cup sizes, but individual breast size may vary depending on how much the infant nurses from each breast. [12] Changes in breast size during pregnancy may be related to the sex of the infant, as mothers of female infants have greater changes in breast size than mothers of male ...
The Interpersonal World of the Infant (1985) is one of the most prominent works of psychoanalyst Daniel N. Stern, in which he describes the development of four interrelated senses of self. [1] These senses of self develop over the lifespan, but make significant developmental strides during sensitive periods in the first two years of life.
There is no sharp limit of development, age, or weight at which a fetus automatically becomes viable. [21] According to data from 2003 to 2005, survival rates are 20–35% for babies born at 23 weeks of gestation (5 + 3 ⁄ 4 months); 50–70% at 24–25 weeks (6 – 6 + 1 ⁄ 4 months); and >90% at 26–27 weeks (6 + 1 ⁄ 2 – 6 + 3 ⁄ 4 ...
Infant Behavior and Development is a quarterly peer-reviewed scientific journal covering developmental psychology in infants. It was established in 1978 and is published by Elsevier. The editor-in-chief is Martha E. Arterberry (Colby College). According to the Journal Citation Reports, the journal has a 2017 impact factor of 1.669. [1]
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