Jerusalem Talmud Sukkah 2.9

משנה: נָשִׁים עֲבָדִים וּקְטַנִּים פְּטוּרִין מִן הַסּוּכָּה. כָּל קָטָן שֶׁאֵינוֹ צָרִיךְ לְאִמּוֹ חַיָיב בַּסּוּכָּה. מַעֲשֶׂה וְיָלְדָה כַלָּתוֹ שֶׁל שַׁמַּי הַזָּקֵן וּפִיחֵת אֶת הַמַּעֲזִיבָה וְסִיכֵּךְ עַל גַּבֵּי הַמִּיטָּה בִּשְׁבִיל הַקָּטָן:

MISHNAH: Women, slaves, and minors are not obligated for the sukkah. Any minor who does not need his mother is obligated for the sukkah. It happened that the Elder Shammai’s daughter-in-law gave birth and he removed the roof insulation and thatched the roof over the bed for the minor.

הלכה: אֵי זֶהוּ קָטָן. דְּבֵית רִבִּי יַנַּאי אָמְרֵי. כָּל שֶׁהוּא צָרִיךְ לְאִמּוֹ שֶׁתְּקַנְּחֶנּוּ. רִבִּי יוֹחָנָן אָמַר. כָּל שֶׁהוּא נֵיעוֹר מִשְּׁנָתוֹ וְקוֹרֵא. אִימָּא. תַּנֵּי רִבִּי הוֹשַׁעְיָה. קָטָן שֶׁאֵינוֹ צָרִיךְ לְאִמּוֹ חַיָיב בַּסּוּכָּה וְיוֹצֵא בְּעֵירוּבָהּ שֶׁלְאִמּוֹ.

HALAKHAH: What is a minor? In the house of Rebbi Yannai they said, any who needs his mother to cleanse him. Rebbi Joḥanan said, any who awakes from his sleep and cries “Mamma”. Rebbi Hoshaia stated: Any minor who does not need his mother is obligated for the sukkah but goes out with his mother’s eruv.