Q. Does vomiting break the fast?
A. Intentional (inducing) vomiting a mouthful nullifies the fast. However, intentional (induced) vomiting less than a mouthful, does not nullify the fast.
On the other hand, if a person vomits unintentionally, irrespective if it is a mouthful or not, the fast will not be nullified. (Hindiyyah).
The definition of “mouthful” is that which one cannot hold back in one’s mouth without difficulty.
Allah Ta’ala Knows Best
Mufti Ismaeel Bassa