Back to maternity Information on how we ensure your baby is as healthy as possible after birth. Your baby's healthInfant feedingPostnatal screening choicesGroup B streptococcusWhooping cough vaccination in pregnancyVitamin K for newborn babies See alsoNegative blood groups and anti-D injectionsIf a mother has an RhD-negative blood group, but her baby's blood group is RhD-positive, this can cause problems during pregnancy.Foetal medicine servicesFoetal medicine focuses on specialist care of unborn babies. Other websitesBaby Sleep Information Source (BASIS)