Cohen S E, Beckwith L
Child Dev. 1977 Mar;48(1):152-7.
Naturalistic home observations of 54 preterm infants and their caregivers were made when the infants were 1, 3 and 8 months of age. Differences were found in the kinds of everyday transactions which occur with preterm infants raised with and without siblings. At 1 month of age the care of firstborn and later-born infants was similar in most ways. At 3 months and 8 months firstborn infants clearly received more responsive care and more stimulation from their mothers than later-born infants. Furthermore, the firstborn infant received more social transactions from anybody. Firstborn preterm infants obtained higher Gesell developmental scores than later-born infants, replicating results reported with infant test performance of full-term infants.
对54名早产儿及其照顾者进行了自然主义的家庭观察，观察时间为婴儿1个月、3个月和8个月大时。研究发现，有兄弟姐妹和没有兄弟姐妹抚养的早产儿在日常互动类型上存在差异。在1个月大时，头胎和后出生婴儿的护理在大多数方面是相似的。在3个月和8个月大时，头胎婴儿显然比后出生婴儿从母亲那里得到了更积极的护理和更多的刺激。此外，头胎婴儿从任何人那里得到的社交互动更多。头胎早产儿的格塞尔发育得分高于后出生婴儿，这与足月婴儿的婴儿测试表现所报告的结果一致。
