When would you use the masculine form of a pronoun for a feminine noun

Question

would you use pronouns ending in 'n' (mon, ton, son) for nouns that begin with vowel or silent h? In doing a recent quiz for the noun 'petite amie' a 'sa' was used... should son have been used instead?

Cécile Janty-Davies · Accepted Answer

Hi A,
"Sa petite amie"(his girlfriend) is correct and the possessive adjective agrees with  the possessed (petite amie) not the possessor (the person whose girlfriend it is) .
Hope this helps!

Chris Wirt · Answer

And you would also use the masculine form if the noun starts with a vowel:
Son amie but sa petite amie. 
Even though amie is feminine, you use son because it starts with a vowel. With petite there's no need for this anymore because it starts with a consonant.

A K · Answer

so in the case of amie, you would not need the 'n' as the adjective does not begin with a vowel. 
the pronoun changes as a result of the word following it and not the noun? 
sa petite amie
son amie