9 months in the womb, 3 months of missing energy

[Runar]

The three first months after birth are covered by the radix or radical chart. https://www.astro.com/astrowiki/en/Radical_Chart

This is made up many times as the first days of your life is covering a year for every day. So the Radix chart is fx. the 20th day after imposed over the native chart. This will tell what forces are out for play in your 20th year. These are called progressions.
Here is a good conversation on the theme.
https://www.quora.com/How-much-influence...atal-chart