Parashas Eikev · Passuk 8:10
When you have eaten your fill, give thanks to the ETERNAL your God for the good land given to you.
Torah Temimah points to Yerushalmi Berachos 3:3.
TT lemma: ואכלת ושבעת וברכת, תניא, נשים ועבדים וקטנים חייבים בברכת המזון, דכתיב (unit 6 of 14).
Sefaria — Yerushalmi Berachos 3:3
English: It was taught: Women, slaves, and minors are obligated in Birkat HaMazon, as it is written, “you shall eat and be satisfied and bless.”
Custom (who is obligated in Birkat HaMazon)
Women, slaves, and minors share the obligation insofar as they share the experience of satiety.