Q我儿子今年四岁了,总是将手指吮到嘴里,因为很不卫生,我急了在说他无济于事的情况下,甚至动手打他,而他仍然“秉性”难改,不知如何是好?郑州 程丽A临床检查发现,经常吸吮手指和咬指甲的 Q My son is four years old and always sucks his finger in his mouth because it is unhygienic. I was in a hurry to say that he was helpless and even hit him, and he was still “unscrupulous.” I do not know how it was Good? Zhengzhou Cheng Li A clinical examination found that often sucking fingers and biting nails