Son anniversaire! goes for his birthday and for her birthday!
and if you want to wish someone a happy birthday it is : Joyeux anniversaire!
a birthday is 'un anniversaire' in French
Birthday is "anniversaire" (masc.) in French.
d'anniversaire
A birthday cake in French is 'un gâteau d'anniversaire'
"Bonaniversè" is how you would say Happy Birthday in Louisiana Creole French.
you say mon gorna be mansa
un anniversaire
"Today is my birthday!" in French is "Aujourd'hui est mon anniversaire !"
you say "son anniversaire"
C'est mon anniversaire.
Joyeux anniversaire
C'est ton anniversaire