For fun
Baby gender predictor
Pick the month you conceived and the age you were then. The predictor looks up that pair on a traditional chart and shows boy or girl. Two numbers go in. One cell comes out. Nothing about the pregnancy is measured.
What the two numbers do
The chart is a table with ages down the side and twelve months across the top. Your age selects the row. The month selects the column. The shared lookup is the same one used on the Chinese gender calendar, so the same age and the same month number always give the same word.
This form uses the month you choose, the way a simple printed grid is often read. It does not move January or February dates that fall before Chinese New Year. If you want that shift, and the full colored chart, use the calendar page and enter the conception date.
What it cannot tell you
The chart is a folk game. Checked against a very large set of birth records, it was right about half the time. Keep the result for a group chat. Ask a clinician when you need to know. When you are ready for names either way, browse boy names, girl names, or how to pick a baby name.