Reference for Bekhorot 4:2

נוֹלַד לוֹ מוּם בְּתוֹךְ שְׁנָתוֹ, מֻתָּר לְקַיְּמוֹ כָּל שְׁנֵים עָשָׂר חֹדֶשׁ. לְאַחַר שְׁנָתוֹ, אֵינוֹ רַשַּׁאי לְקַיְּמוֹ אֶלָּא עַד שְׁלשִׁים יוֹם:

If it develops a blemish within its first year, [the owner] is permitted to keep it the entire first year. [If it develops a blemish] after the first year, [the owner] is allowed to keep it only thirty days.

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