1.The Class B drugs that can be chosen for nucleoside analogues in the expectant period are: telbivudine and tenofovir. 2.The effectiveness of applying hepatitis B immunoglobulin during the expectant period is not supported by evidence-based medical evidence, and the role of blocking mother-to-child transmission is not clear. 3. Most patients taking oral nucleoside analogues during the expectant period can stop taking the drugs after only 16 weeks, but they need to stop taking the drugs under the guidance of doctors. 4. Breastfeeding is not recommended while taking antiviral drugs.