Among the five senses, the sense of touch is the most primitive, and the skin is the largest surface sensory organ, which is the external receptor of the central nervous system, so the stimulation of touch can promote the development of the nervous system. Touching can promote the maturity of infants' recognition, motor and social skills. Social touch is a powerful force can shape social reward, attachment, cognitive, communication, and emotional regulation from infancy and throughout life. When a newborn is born, it has responded to various stimuli from the external environment, and has basic physiological functions such as sight, hearing, touch, smell, and taste. At the same time, there will be some temporary primitive reflexes, through which the neonatal nervous system can be detected.

Nathalie Xue. The influence of the difference in early touch receiving from single-parent families and two-parent families on children’s sociability. International Journal of New Developments in Engineering and Society (2020) Vol.4, Issue 4: 112-122. https://doi.org/10.25236/IJNDES.040410.

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[3]Evan, L. A., & Catharine, H.R.(2010).The importance of touch in development. Paediatrics & Child Health, 15(3), 153-156. https://doi.org/10.1093/pch/15.3.153