Rosemary Kennedy's mother had the unfortunate luck of giving birth during at tuberculosis outbreak in the caused a shortage of doctors and adequate medical professionals. Since the Kennedys were already such a prostitute family, the nurses at the scene of her birth feared the possibility of participation without the qualified medical professional present. Hence, Rosemary Kennedy was held inside her mother's womb and deprived of oxygen for over 2 hours. As you can expect, this would lead to a lot of developmental issues for a child