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婴儿时期把手放嘴里是很自然的反射,但过了口腔期(2岁左右),就不该再有常把手放到嘴里的行为。而咬指甲的行为通常在3~4岁时开始出现,随着年纪增长逐渐增加,到青少年时期达到高峰,接着逐渐减少。孩子会咬指甲、吸手指,其实,这是儿童时期常见的习惯,通常是用来让自己感到舒适愉悦、减压,甚至也被认为是一种冲动控制异常的行为。真的是这样吗?传统认为咬指甲是由于孩子感到焦虑和有压力,但研究发现,这不是主要的原因,目前推测孩子咬指甲的主要
It is natural to put your hand on your baby during the baby’s time, but after the oral cavity (about 2 years of age), there should be no more hands on your mouth. Biting fingernails, however, usually starts at 3 to 4 years old, gradually increases with age, reaches its peak in adolescence, and then decreases gradually. In fact, this is a common childhood habit, often used to make one feel comfortable, relieved, and even considered an impulse to control abnormal behavior. Really? The traditional view that bitten nails is due to children feel anxious and stressful, but the study found that this is not the main reason, the current speculation that children bite nails of the main