Adbhutasagara 49.10

49.10

nāradaḥ|
bālānāmaṣṭame māsi daśame'pi tathā punaḥ|
dantā yasya vijāyante mātā vā mriyate pitā||

Nārada says:
In the case of children, in the eighth month, or again in the tenth,
he whose teeth emerge—either his mother or father dies.