Has outgrown his swaddling clothes
Figuratively: has already grown up; has become more mature and at a higher level.
(Modern Hebrew)
Translation
Expression (Hebrew)
יָצָא מֵחִיתּוּלָיו
Definition (Hebrew)
בְּהַשְׁאָלָה: הִתְבַּגֵּר כְּבָר. הָפַךְ לִהְיוֹת בְּרָמָה גְּבוֹהָה יוֹתֵר.
(הָעִבְרִית הַחֲדָשָׁה)