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Let's say the genders, personality AND health of Charles de Valois, Duc d'Angouleme and of Marie Elisabeth de France are reversed.
So by the time of death of Charles IX in 1574 he has a 2-years legitimate son and a rather obscure illegitimate daughter.
In OTL the Duc d'Angouleme lived till 1650. So the reign of TTL Charles X will be pretty long (1575-1650). And with his interesting personality...it will be fulfilling.
https://en.wikipedia.org/wiki/Charles_de_Valois,_Duke_of_Angoulême
The obvious results is that OTL Henri III may stay the King of Poland, and OTL Henri IV may stay the King of Navarre.
Catherine de Medici will likely become the regent for her infant grandson, though Elisabeth of Austria (never to return to Austria TTL) is a likely contender, so we'll see a tug-of-war between Queen-Mother and Queen-Grandmother.
And Marie de Medici may still happen TTL as Queen of France - she's 3 years younger that TTL Charles X. Other than her, marriage alliance with Lorraine may be suggested, but the likely bride, first cousin of TTL Charles X, Elisabeth of Lorraine, OTL Duchess of Bavaria, is sterile.

I'd say the childhood of this boy will have a LOT in common with the childhood of Louis XIV - a child king on the throne of the country during the civil war.
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