Disappointing news
Bill and Sarah's doctor, Dr Mancuso, provided disturbing news about the pregnancy. Only about one in a million pregnancies will experience the incredible rarity of monoamniotic twins. There is only one amniotic sac, and both babies usually develop inside it. It was the most extreme case of having twins possible. Sadly, this may also indicate that one or both twins will not survive to term. Sarah would need to take several safety measures.