The Compendium of Bheḷa 4.5.9

4.5.9

iha khalu bhoḥ garbhātsthirādantaḥsthādāyatamudaraṃ[-sthitāvasthātamā] bhavati madhye nāryāmantargatāyām | sthūlamūlasaṃsthitasaṃvṛttamacchidraṃ puruṣo ' ntargate | droṇīvodaraṃ[droṇicodaraṃ] bhavatyubhayor antargatayoḥ | vāmaṃ pārśvamāyataṃ māturudarasthā strī, dakṣiṇe pumān, madhye napuṃsakam | vāmamakṣi hrasati nāryāmantargatāyām, puruṣe dakṣiṇam, ubhe napuṃsake | savyaṃ pādaṃ pūrvaṃ prakrāmati savyena cākṣṇā bhruvā ca pūrvaṃ prati kurute, ceṣṭateca[na]savyena[sarvena] pārśvena prāyaḥ saṃviśati[śaṃsate] strīsaṃjñāneṣu ca prāyaśo dauhṛdaṃ kurute nāryāmantargatāyām | viparyaye tadataḥ puruṣaṃ bibhartīti vidyāt ||

Here indeed, sir, the abdomen is elongated from the firm fetus residing inside in the middle when a female child is within. When a male child is within, [the abdomen] is situated with a broad base, rounded, and without hollows. The abdomen is like a trough when both are within. When a female child is in the mother's abdomen, the left side is elongated; when a male child, the right; when a hermaphrodite, the middle. The left eye grows small when a female is within; in the case of a male, the right; both, in the case of a hermaphrodite. She steps forward with the left foot first, reacts first with the left eye and eyebrow, moves and mostly lies down on the left side, and mostly develops pregnancy cravings for female concepts when a female is within. In the reverse case, one should know that she carries a male.