Shatapatha Brahmana 9.5.1.63

9.5.1.63

ṣaṇmāsyamantamaṃ cinvītetyāhuḥ | ṣaṇmāsyā vā antamā garbhā jātā jīvantīti sa yadyasaṃvatsarabhṛte mahadukthaṃ śaṃsedṛgaśītīḥ śaṃsedasarvaṃ vai tadyadasaṃvatsarabhṛto 'sarvaṃ tadyadṛgaśītayo vikṛṣṭaṃ tvenaṃ sa bhūyo vikarṣedyadi caiva saṃvatsarabhṛtaḥ syādyadi cāsaṃvatsarabhṛtaḥ sarvameva mahadukthaṃ śaṃset

'A six-month (Agni) is the last he may build,' they say, 'for six-month embryos are the last that live when born.' If he were to recite the Great Litany on one not carried for a year, he should recite (only) the eighties of verses, for something incomplete is (the Agni) not carried for a year, and something incomplete are the eighties of verses. But, indeed, he would only still further pull asunder that (Agni, already) pulled asunder; and, indeed, whether he (Agni) be carried for a year, or not carried for a year, he (the Hotri) should recite the whole of the Great Litany.