What invalidates fasting
1. Intentional eating and drinking.
2. Intentional sexual intercourse.
3. Intentional ejaculation.
4. Intentional vomiting.
5. Menstruation and postpartum in any part of the day.
6. Nutrient injections.
7. Not stating al-niyyah to obligatory fasting.
All of these invalidators necessitate -for the unexcused person- sincere repentance and making up for the missed days of fasting. In addition to the hard penance in the case of sexual intercourse which is manumit, if it is not possible, then fast for two months consecutively. If not possible, then one should feed sixty poor persons.