Your son was born on a Navami tithi. For this tithi, Leo and Scorpio signs are Dagdha (burnt) rasis. Their lords Sun and Mars are also considered as Dagdha. For the chart, Leo is the Lagna and the 7th lord of marriage Saturn is in Scorpio aspected by Mars.
In addition, Venus, the karaka for marriage, is in the 6th bhava in the bhava chart. This leads to his being in Marana Karaka Sthana.
A shanti for Mars and Sun and strengthening Venus by reciting Devi Laxmi stotras, wearing diamond ring or pendant can help.