Streptococcus b infection in pregnant women may increase the risk of premature rupture of membranes, intrauterine fetal infections, etc. Prophylactic treatment as prescribed by the doctor before delivery has a better prognosis. Group B streptococcus is a gram-positive cocci, infection during pregnancy will increase the risk of premature rupture of membranes, intrauterine fetal infections, and even lead to fetal death, neonatal infections, and even endanger the life of the newborn and other serious risks, so during pregnancy, follow the doctor’s orders at 35 to 37 weeks of pregnancy for secretion group B screening, and give antibiotics such as penicillin and other antibiotic prophylactic treatment before delivery. Prenatal checkups during pregnancy should always be performed on time as prescribed by the doctor, to enable early screening for pregnancy comorbidities or complications, timely detection of fetal anomalies, and active intervention to reduce the risk of pregnancy. They can also assess fetal growth and development and intrauterine conditions, and determine the timing and mode of delivery to ensure the safety of the mother and child during pregnancy.