Abstract: Objective To study the status and influencing factors of delayed initiation of lactation phase Ⅱ in parturients in Baoshan district of Shanghai. Methods Taking parturients who were hospitalized in a hospital in Shanghai from January to December 2020 as the research object to follow up the initiation of lactation phase II, the self-made questionnaire was used to collect postpartum depression, anxiety and fatigue. The descriptive epidemiological analysis method was used to analyze the occurrence of delayed initiation of lactation phase Ⅱ in parturients in Shanghai, and univariate and multivariate analysis methods were used to analyze the influencing factors of the delay. Results The average age of 1 188 parturients was （28.11 ± 3.48） years. The time of lactation phase II initiation was （74.67 ± 5.22） h. A total of 312 cases had delayed initiation of lactation phase Ⅱ, with an incidence rate of 26.26%. There was a higher incidence of delayed initiation of lactation phase Ⅱ in parturients with an age of ≥ 35 years, gestational hypertension, gestational diabetes, cesarean section, primipara, time from birth to lactation ≥ 30 min, postpartum depression, postpartum anxiety and postpartum fatigue （all P<0.05 or P<0.01）. Multivariate Logistic regression analysis showed that age ≥ 35 years old （OR=2.516）, complicated with gestational hypertension （OR=2.520）, complicated with gestational diabetes （OR=2.994）, cesarean section （OR=1.578）, primipara （OR=2.164）, time from birth to lactation ≥ 30 min （OR=1.091）, postpartum depression （OR=3.769）, and postpartum anxiety （OR=3.174） were risk factors for the delayed initiation of lactation phaseⅡ. Conclusion The incidence of delayed initiation of lactation phase Ⅱ is relatively high in Baoshan district, Shanghai. Age ≥35 years old, gestational hypertension, gestational diabetes, cesarean section, primipara, time from birth to lactation ≥ 30 min, postpartum depression, and postpartum anxiety were risk factors of delayed initiation of lactation phaseⅡ. The above risk factors should be identified and intervened to reduce the incidence of delayed initiation of lactation phase Ⅱ.

Key words: Parturient, Delayed initiation of lactation phase Ⅱ, Status, Influencing factor