美国著名的儿科专家、哈佛大学儿科教授布拉泽尔顿长期研究新生儿。他曾对同卵双胎的一对男婴进行观察,发现同卵新生儿之间也存在着明显的差异。他认为每个正常婴儿从出生开始就呈现出明显的差异。他将婴儿大体分为三种类型:安静型、活泼型、中间型。他指出,每种类型的婴儿都是按照各自 Brazen, a famous American pediatrician and pediatric professor at Harvard University, has long studied newborns. He had observed a pair of baby boys with identical twins and found that there were also significant differences between identical newborns. He thinks every normal infant shows a clear difference from birth. He classifies babies in three general categories: quiet, lively, and intermediate. He pointed out that each type of baby is according to their own