It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever vomits unintentionally, there is no obligation of making up the fast upon him, but whoever induces vomiting deliberately, he must make up his fast (because his fast is broken).
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10463