Quick answerWhich lunar month does Tiểu Mãn fall in?
The fourth lunar month. Tiểu Mãn is the principal term of the fourth month, and from 2025 to 2030 the day it begins falls between the 5th and the 26th of the fourth month, for example the 5th day of the fourth month in 2026 and the 16th in 2027. In Bát Tự, someone born during Tiểu Mãn still belongs to the Tỵ month, because the month changes only at Lập Hạ and Mang Chủng.
From the article “What Is Tiểu Mãn, When Does It Begin, and What Customs Come With It?”
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73,414 rowsVersion 1.2.2
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790 rowsVersion 1.3.0
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197 rowsVersion 1.4.0
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3,652 rowsVersion 1.1.1