关键词: 二孩出生前后, 大孩, 行为变化, 家庭结构

Abstract: Objective To explore the behavior changes of the firstborn children after the birth of the second children, and to analyze its influencing factors, in order to provide reference for the firstborn children getting along with the second children. Methods From March to December 2019, 94 mothers in the middle and late stages of pregnancy who were pregnant with a second child were recruited from two tertiary hospitals in a district of Chongqing to learn about the situation of their first child through questionnaires, and were followed up until the second child was 2 months old. Logistic regression model was used to analyze the correlation of demographic characteristics and family factors with behavioral changes of firstborn children. Results Among the 94 firstborn children, 43 were boys and 51 were girls, with an average age of (4.25±2.31) years old. When the second child was 2 months old, the behavior changes occurred in all the firstborn children. Among them,57.4% were dominated by positive behavior changes, and 61.7% had both positive and negative behaviors. Univariate analysis showed that firstborn children's age, relationship with parents, parenting style of father and parenting way were influencing factors of behavioral changes of the firstborn children (P<0.05). Multivariate Logistic regression analysis showed that firstborn children with older age (OR=2.543, 95%CI: 1.196 - 5.366) were more likely to have positive behavior changes towards their mother/second child, while those with intergenerational and co-parental rearing (OR=3.402, 95%CI: 1.033 - 11.195) were more likely to have negative behavior changes towards themselves. Conclusions Two months after the birth of the second child, the firstborn children all experience behavioral changes, and most of them show both positive and negative behavior, with positive changes predominating. Age and parenting way are the main influencing factors of behavior changes of the firstborn children.

Key words: before and after the birth of the second child, firstborn children, behavioral change, family structure