Clinical Research Directory

Inclusion Criteria: Common criteria for half-dose studies and exploratory studies: 1. Age 18-40 years (inclusive); 2. Body mass index (BMI) 18.5-27.9 kg/m2 (inclusive). 3. risk of preterm labour and use of dexamethasone for fetal lung maturation. Half-dose study-specific criteria: (1) Greater than or equal to 34+0 gestational weeks and less than or equal to 35+6 gestational weeks at enrolment; Exploratory study-specific criteria: 1. Greater than or equal to 34+0 gestational weeks and less than or equal to 38+6 gestational weeks at enrolment; 2. Confirmed diagnosis of GDM or having diabetes mellitus. Exclusion Criteria: 1. Multiple pregnancies (three or more pregnancies) 2. For subjects who are unable to be included in this study in the following cases: 3. Pregnant women with ectopic pregnancy 4. Fetal distress, severe infectious (e.g. sepsis, infectious shock) disease, fever; 5. Those who have taken glucocorticoid drugs within 2 weeks before joining the clinical trial; 6. Those who took clindamycin during the study period; 7. Those with congenital foetal anomalies or foetal hypoxia occurring in early pregnancy; 8. Patients with convulsions; 9. Those with a history of HIV/HCV/hepatitis A, substance abuse; 10. Chorioamnionitis, endometritis; 11. Placental abruption, use of surfactant, severe intrauterine haemorrhage; 12. Pregnant women with cervical dilatation greater than or equal to 4 cm or ultrasonographic neck length greater than or equal to 20 mm; 13. Pregnant women taking food or drugs during the study period that may affect foetal safety; 14. Pregnant women participating in other clinical trials. 15. Gestational diabetes mellitus and patients with diabetes mellitus (exclusion criteria for half-dose studies only).