The Chinese gender predictor: folklore and evidence

The chart

The Chinese gender predictor is an age-and-month lookup chart. A row represents the mother's stated lunar age at conception, a column represents the lunar month of conception, and their intersection supplies a boy-or-girl label. It is a fortune-telling use of calendar labels, separate from the astronomical rules that construct the Chinese lunisolar calendar.

The age convention matters: nominal age counts calendar years entered, while completed age counts birthday anniversaries. The conception month also depends on the date conversion and any rule for handling a leap month. These choices affect which cell is read, but accurate calendar conversion does not make its prediction reliable.

Evidence

The chart does not provide a reliable way to predict a baby's sex. Correct guesses can occur by chance, so remembered successes do not establish predictive reliability.

Different charts, age-counting rules and lunar-date conventions may change the answer. None of these adjustments makes the chart a medically validated test.

Origins and folklore

The chart is often linked to the Qing dynasty in popular accounts, but its precise origin remains uncertain. The imperial connection belongs to its folklore.