I have no idea what their actual rationale is, but many STIs including HIV can be passed from mother to newborn. With an intensive treatment regimen the risk c

I have no idea what their actual rationale is, but many STIs including HIV can be passed from mother to newborn. With an intensive treatment regimen the risk can be made very low: https://aidsinfo.nih.gov/understanding-hiv-aids/fact-sheets/20/50/preventing-mother-to-child-transmission-of-hiv https://aidsinfo.nih.gov/understanding-hiv-aids/fact-sheets/...