Parent Infant Skin-to-Skin Contact Intervention Based on The Co-parenting Theory

Postpartum Parental Safety Scale，PPSS is a survey tool used to assess the sense of security of both parents after childbirth, and to assess the sense of security of parents in the first week after delivery.The Chinese version of PPSS scale is divided into mother version and father version.The PPSS mother version had 18 items and the father version had 13 items, all of which were scored using a four-level scoring method ( 1-4 points ). Mother version of the scale minimum score of eighteen points, the highest score of seventy-two ; the minimum score of the father 's version scale is 13 points, and the maximum score is 52 points.The answer options ranged from ' very disagree ' to ' very agree '. The higher the score, the higher the sense of security.

The Brief Coparenting Relationship Scale ( Brief CRS ) was jointly developed by Feinberg, Brown and Kan in 2012. The scale uses a self-reported approach to comprehensively assess the quality of coparenting in a family. It consists of 14 items and 7 subscales.The Brief Coparenting Relationship Scale can be used as a tool to measure the effect of father in coparenting in Chinese family． The scale can be used to measure father's support and involvement with breastfeeding in the study of breastfeeding．All items were scored by Likert 7, of which 3 items were reverse scoring, with a total score of 0-84. The higher the score, the better the co-parenting, that is, the stronger the father 's support.

The Maternal Postnatal Attachment Scale ( MPAS ) is a self-reported scale developed by Condon and Corkindale to reflect the degree of subjective emotional connection between mothers and their infants.The Maternal Postnatal Attachment Scale is a valid and reliable tool for the evaluation of the early affectionate mother-infant relationship.The scale has 18 items, including two, three, four and five options.The total score span of the scale is between 18-90, and the higher the score, the higher the level of maternal and child attachment.

Father-infant attachment will be evaluated by the use of the Paternal Postnatal Attachment Scale (PPAS) originally designed by John T. Condon and colleagues. This is a 19-item, self-report questionnaire including three subscales: patience and tolerance, pleasure in interaction, and affection and pride.The total score span of the scale is between 19-95, and the higher the score, the higher the level of attachment between father and baby.

French Ameil Tison neonatal neuromotor examination method, combined with the specific situation in China.It is also of great significance for understanding the behavioral abilities of newborns, promoting early development of eugenics and intellectual cognition.NBNA examination is divided into five parts, including six items of neonatal behavioral ability, four items of passive muscle tone, four items of active muscle tone, three items of Primitive reflexes, and three items of general response, with a total of 40 points. The higher the score, the better the behavioral neurological function.

The Self-Rating Anxiety Scale,SAS will be used by both parents to assess the anxiety levels.The self-rating anxiety scale compiled by Zung in 1971 is a self-rating scale, which is used to evaluate the subjective feelings of adults and the degree of anxiety. The scale includes 20 items, including 15 positive scores and 5 negative scores. According to the frequency of symptoms defined by the item, the Likert 4-level scoring method was used. From ' no or little time ' to ' most or all of the time ', the positive scoring questions were rated as 1-4 points, and the reverse scoring questions were rated as 4-1 points. Standard score = total coarse score * 1.25, take the integer part, with SAS standard as the cut-off value, the cut-off value is less than 50 points for no anxiety group, 50 ~ 59 points for mild anxiety group, 60 ~ 69 points for moderate anxiety group, 69 points or more for severe anxiety group.

The Self-Rating Depression Scale,SDS will be used by both parents to assess the depression level.Self-Rating Depression Scale ( SDS ) is a self-rating scale compiled by Zung in 1965, which is used to evaluate the subjective feelings of adults and the severity of depression. It includes 20 items, using a 4-level score, 10 positive score items, and 10 reverse score items. The total rough score was obtained by adding the scores of 20 items. The standard score = total rough score * 1.25, and the integer part was taken. The standard value of SDS was divided into the boundary value. The boundary value was less than 53, which was divided into the non-depression group, 53-62 was divided into the mild depression group, 63-72 was divided into the moderate depression group, and more than 72 was the severe depression group.