From the Han Dynasty to the Tang, Song, Yuan, Ming and Qing Dynasties, there is no literature about the prediction table of boys and girls in Sikuquanshu, ancient books, medical books and documents of previous dynasties. The forecast table for boys and girls only keeps pictures, but does not indicate its detailed description, so its authenticity has no textual research source. It is said that the forecast table for boys and girls is formed by Heluo number, Yijing number, Dayan number, calendar calculation and deduction.
Experts also believe that the characteristics of having a boy have little to do with eating acid or alkali. Expectant mothers have different pregnancy reactions, so their tastes will become changeable. It is not correct to judge whether food is alkaline or acidic only by taste. Acidity and saltiness are a matter of personal taste. Expectant mothers with acid-base imbalance are generally caused by diseases.