To study the clinical features of very preterm small-for-gestational-age infants born by cesarean section due to severe preeclampsia. Forty-two small-for-gestational-age infants who were admitted from August 2017 to July 2018 and were born due to severe preeclampsia were enrolled as the observation group. Forty very preterm infants who were born to healthy mothers since uterine contractions could not be suppressed were enrolled as the control group. Perinatal features, clinical manifestations of infection, complications, and clinical outcomes were analyzed for the two groups. Within 6 hours and 2-3 days after birth, the observation group had significantly lower white blood cell count (WBC), absolute neutrophil count (ANC), and platelet count (PLT) than the control group ( < 0.05). At 5-7 days after birth, there was no significant difference in WBC between the two groups ( > 0.05), while the observation group still had significantly lower ANC and PLT than the control group ( < 0.05). The oitored for early identification of infection, timely diagnosis, and timely adjustment of antibiotic treatment, so as to improve the outcome. To study the association of different stages of histological chorioamnionitis (HCA) with the incidence rate and severity of respiratory distress syndrome (RDS) in preterm infants. Related data were collected from the infants and their mothers who were treated in the Neonatal Intensive Care Unit of Qingdao Women and Children's Hospital, Qingdao University, from January 2018 to June 2020. According to the presence or absence of HCA and its stage, the infants were divided into four groups control ( =109), early-stage HCA ( =126), middle-stage HCA ( =105), and late-stage HCA ( =36). The four groups were compared in terms of gestational age, birth weight, sex, maternal age, placental abruption, prenatal use of antibiotics, and incidence rate of RDS. The correlation between HCA stage and RDS severity was analyzed. Compared with the control and late-stage HCA groups, the early-stage HCA group had a significantly lower incidence rate of placental abruption and a significantly higher rate of prenatal use of antibiotics ( < 0.05), and the early-stage HCA group had a significantly lower incidence rate of RDS than the control group ( < 0.05). The multivariate logistic regression analysis showed that early-, middle-, and late-stage HCA were protective factors against RDS ( < 0.05). The Spearman test showed that the severity of RDS in preterm infants was not correlated with the HCA stage ( > 0.05). Early-, middle-, and late-stage HCA can reduce the incidence rate of RDS in preterm infants. HCA stage may not be correlated with RDS severity in preterm infants, which needs to be verified by further research. Early-, middle-, and late-stage HCA can reduce the incidence rate of RDS in preterm infants. HCA stage may not be correlated with RDS severity in preterm infants, which needs to be verified by further research. To study the perinatal complications of late preterm twins (LPTs) versus early term twins (ETTs). A retrospective analysis was performed for the complications of 246 LPTs, 496 ETTs, and their mothers. The risk factors for late preterm birth were analyzed. According to gestational age, the twins were divided into five groups 34-34 weeks ( =44), 35-35 weeks ( =70), 36-36 weeks ( =132), 37-37 weeks ( =390), and 38-38 weeks ( =106). The perinatal complications were compared between groups. Maternal hypertension, maternal thrombocytopenia, placenta previa, and premature rupture of membranes were independent risk factors for late preterm birth in twins ( < 0.05). The LPT group had higher incidence rates of respiratory diseases, feeding intolerance, and hypoglycemia than the ETT group ( < 0.05). The 34-34 weeks group had a higher incidence rate of neonatal asphyxia than the 37-37 weeks and 38-38 weeks groups; and had a higher incidence rate of septicemia than 36-36 weeks group e LPTs and ETTs. To study the effect of weight growth velocity in the early stage after birth on the neurodevelopment of preterm infants at the corrected age of 12 months. Related data were collected from the preterm infants who were discharged from the Department of Neonatology, Third Affiliated Hospital of Guangzhou Medical University, from July 1, 2015 to December 31, 2019 and were followed up at the outpatient service of high-risk infants. https://www.selleckchem.com/products/ki16198.html According to the weight growth velocity from birth to the corrected gestational age of 40 weeks, the infants were divided into two groups low velocity [< 10 g/(kg·d); =21] and high velocity [≥10 g/(kg·d); =87]. At the corrected ages of 3, 6, and 12 months, Gesell Developmental Schedules were used to evaluate and compare neurodevelopment between the two groups. At the corrected age of 12 months, the low velocity group had a significantly lower score of fine motor ( < 0.05) and a significantly higher abnormal rate of language ability score compared with high velocity ( < 0.05). For the preterm infants with a birth weight of < 1 500 g or ≥1 500 g, the low velocity group had a significantly lower score of fine motor than the high velocity group ( < 0.05); for the preterm infants with a birth weight of ≥1 500 g, the low velocity group had a significantly higher abnormal rate of language ability score than the high velocity group ( < 0.05). The weight growth velocity from birth to the corrected age of 40 weeks affects the development of fine motor and language in preterm infants at the corrected age of 12 months; however it needs to be further verified by large-sample studies. The weight growth velocity from birth to the corrected age of 40 weeks affects the development of fine motor and language in preterm infants at the corrected age of 12 months; however it needs to be further verified by large-sample studies. To study the clinical effect of multi-oil fat emulsion for parenteral nutrition support in extremely low birth weight (ELBW) infants. A retrospective analysis was performed for 49 ELBW infants who were admitted from January 1, 2018 to July 30, 2020, with an age of ≤14 days on admission and a duration of parenteral nutrition of > 14 days. According to the type of lipid emulsion received, the ELBW infants were divided into two groups soybean oil, medium-chain triglycerides, olive oil, and fish oil (SMOF) ( =26) and medium-chain triglycerides/long-chain triglycerides (MCT/LCT) ( =23). The two groups were compared in terms of clinical features, complications, nutrition support therapy, and outcome. The 49 ELBW infants had a mean birth weight of (892±83) g and a mean gestational age of (28.2±2.3) weeks. There was no significant difference between the two groups in the incidence rates of hemodynamically significant patent ductus arteriosus, intraventricular hemorrhage, neonatal necrotizing enterocolitis, retinopathy of prematurity, bronchopulmonary dysplasia (BPD), grade Ⅲ BPD, sepsis, and pneumonia ( > 0.