If the papaya is unripe, it isn't safe. An unripe or semi-ripe papaya is rich in a substance called latex. Research shows that this concentrated form of latex may trigger uterine contractions. Also, papaya skin and seeds shouldn't be eaten.
As a safety measure, many pregnant mums exclude papaya from their diets altogether. Despite the research, it is a traditional belief that eating papaya can cause miscarriage and stillbirth.