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Gestational age: 8 weeks and 0 days until 8 weeks and 6 days old. 57–63 days from last menstruation. Embryonic age: Week nr 7. 6 weeks old. 43–49 days from fertilization. The embryo measures 18 mm (3 ⁄ 4 in) in length. Fetal heart tone (the sound of the heart beat) can be heard using doppler. Nipples and hair follicles begin to form.
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.
This clickable timeline template, wikilinked to over 30 Wikipedia articles, translated into over 25 languages, edited by over 40 editors, transcluded to over 120 articles, was originally derived from {{Life timeline}} for inclusion in the article "Timeline of human evolution". It is not an article!
Physical development. Typically grows at a similar rate to the previous month, usually growing between 1 and 1.5 inches (2.5 and 3.8 cm) and gaining about 2 pounds (910 g). [23] Resting heart rate is usually between 80 and 160 beats per minute, and it typically stays within that range until the infant is about one year old. [18] Motor development
This template constructs a vertically arranged timeline. The editor defines 2D rectangles (bars) and optional annotations (notes). The header is customizable. A scale appears on the left, and annotations appear on the right. An optional legend appears at the foot. Has built-in compatibility for geological divisions.
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A Ragdoll kitten. A kitten is a juvenile cat. After being born, kittens display primary altriciality and are fully dependent on their mothers for survival. They normally do not open their eyes for seven to ten days. After about two weeks, kittens develop quickly and begin to explore the world outside their nest.
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.
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