וַיִּגְדַּ֥ל הַיֶּ֖לֶד וַיִּגָּמַ֑ל וַיַּ֤עַשׂ אַבְרָהָם֙ מִשְׁתֶּ֣ה גָד֔וֹל בְּי֖וֹם הִגָּמֵ֥ל אֶת־יִצְחָֽק׃
L’enfant grandit, il fut sevré. Abraham fit un grand festin le jour où l’on sevra Isaac.
Rashi on Genesis
ויגמל AND HE WAS WEANED — at the expiration of twenty- four months (Gittin 75b).
Rashbam on Genesis
ויגמל, he was separated from depending on his mother’s nipples.
Radak on Genesis
ויגדל הילד ויגמל , he stopped receiving mother’s milk. This occurred after he was 24 months old. This was the standard period that babies nursed at the breasts of their mothers.