Your chart shows that if you marry a second time, the partner will be good to your child.
It is not wise to analyse the child’s chart now. Since you wanted the details of weak planets, the same is given below.
1. Sun: Placed in the 4th house – his directional strength is low.
2. Mars: Though vargottama and in its exaltation house, he is in the rasi sandhi. He is also
having a low directional strength like the Sun. But he also gives one of the good good
pancha mahapurusha (Ruchaka) yoga.
3. Mercury: He is debilitated in Navamsa. But he can give a Rajayoga since he is a Trikona
lord in a Kendra.
Other planets have average strength.
Jupiter, though having average strength, is afflicted by two malefics Mars and Saturn.
Moon, though occupying its debilitation sign, gets a cancellation of debilitation from Mars. But he is aspected by malefics Saturn and Rahu. He also occupies a Gandanta Nakshatra.
A shanti for Jyeshta Nakshatra may be done now. No need to do any other strengthening of planets at this stage.