Are there sensitive periods during early development?

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Are there sensitive periods during early development?

From the moment of conception to the moment we are born and grow into adulthood, the timing of even the first beginning of our life journey is crucial. Even the timing of fertilization can be too soon or too late in which will cause the organism to be destroyed. (The Development of Children, 2nd ed).

The mother carrying a baby has a responsibility to ensure enough nutrition is supplied for the rapid growth of the organism. However it is also crucial that the fetus also plays a part to survive, by being active and moving to develop. Hamburger, 1975 illustration of fetal activity (as cited in The Development of Children, 2nd ed. p.87.) indicates that fetal activity is important to develop, this was indicated by his experiment with chick embryos, that when the chicks embryo is immobilized of excess neurons that ordinarily associate with neuromuscular development, then the results are disastrous. In as little as 1 – 2 days the joints of the chick embryos become fixed into unresponsive structures, showing evidence that movement is necessary for connection between the bones to develop.  

The prenatal development is a sensitive time for the baby to develop even its mental health as demonstrated by Henry David, 1981 (as cited in the development of children. 2nd ed, p.91) where he followed up the lives of 220 children who were born to mothers who were experiencing a great deal of stress, due to not having expecting to get pregnant, or not feeling ready for motherhood and many of who wanted the baby to be terminated, yet were refused abortion due to being medically proven to be capable of completing through with the pregnancy and raising the child. The children born were matched compared to babies born from mothers who were happy that they were pregnant, and more likely to be in a better financial state and in a happy relationship. The unwanted children born weighed less at birth and needed more medical care even though the mothers were judged to be in good health. Fewer of the children were breast fed, they had more difficulties in school, and they were referred for psychiatric help more often as teenagers. Also that by the time they had reached adulthood, many were more likely to have antisocial behavior problems. So here we can see from this research that stress also plays a vital role of a healthy developing baby.

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Some fact (Yarrow, 1961, as cited in Early Experience, 1967) states that also the first few years of life have crucial effects upon later development and adult characteristics and that the significance of early infantile experience for later life development has been repeated so frequently and so seriously that the general effectiveness of this declaration is now almost unchallenged. Bowlby, 1951, (as cited in Early Experience, 1967) quotes that  “the prolonged deprivation of the young child of maternal care may have grave and far-reaching effects in his character and so on the whole of his future life.”  In comparison ...

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