Sucked it in with his mother's milk/ imbibe with mother's milk
Figuratively: absorbed it from early childhood; brought up on it since infancy.
(Modern Hebrew)
Translation
Expression (Hebrew)
יָנַק עִם חֲלֵב אִמּוֹ
Definition (Hebrew)
בְּהַשְׁאָלָה: סָפַג אֶת הַדָּבָר מִשַּׁחַר יַלְדוּתוֹ. חֻונַּךְ עַל כָּךְ מְשַׁחֶרֶת יַלְדוּתוֹ.
(הָעִבְרִית הַחֲדָשָׁה)