The Compendium of Kāśyapa 3.4.p41

3.4.p41

prāṇastu bījadhātuṃ hi vibhajatyasthisaṃkhyayā
praviṣṭamātraṃ bījaṃ hi raktena pariveṣṭyate
śukrādasthyasthito māṃsamubhābhyāṃ snāyavaḥ smṛtāḥ
sarvendriyāṇi garbhasya sarvāṅgāvayavāstathā
tṛtīye māsi yugapannirvartante yathākramam
praspandate cetayati vedanāścāvabuddhyate
sūkṣmapravyaktakaraṇastṛtīye tu manodhikaḥ
caturthe sthiratāṃ yāti garbhaḥ kukṣau nirāmayaḥ
gurugātratvamadhikaṃ garbhiṇyāstatra jāyate
māṃsaśoṇitavṛddhistu pañcame māsi jīvaka
garbhiṇī pañcame māsi tasmāt kārśyena yujyate
balavarṇaujasāṃ vṛddhiḥ ṣaṣṭhe mātuḥ śramo'dhikaḥ
sarvadhātvaṅgasaṃpūrṇo vātapittakaphānvitaḥ
saptame māsi tasmācca nityaklāntā'tra garbhiṇī
aṣṭame garbhiṇīgarbhāvādadāte parasparam
ojo rasavahāyukteḥ pūrṇatvācchalayatyapi
tasmāttatra muhurglānā muhurhṛṣṭā ca garbhiṇī
atyayaṃ cāpnute tasmānna māso gaṇyate'ṣṭamaḥ
navamādiṣu māseṣu janma cāsya yathākramam
pūrvadehakṛtaṃ karma garbhāvāsasukhāsukham
jātaḥ smarati tāvacca yāvannopaiti jīvikām

The breath of life indeed divides the seed-element according to the number of bones;
for the seed, as soon as it enters, is enveloped by blood.
From semen comes bone, from bone comes muscle, and from both are ligaments declared to arise.
All the sense faculties of the embryo, as well as all its limbs and appendages,
arise simultaneously in the third month in proper order.
It moves, it becomes sentient, and it perceives sensations;
in the third month its organs are subtle yet manifested, and its mind is heightened.
In the fourth month the embryo attains stability in the belly, free from affliction;
a heightened heaviness of limbs then arises in the pregnant woman.
In the fifth month occurs the increase of muscle and blood, O Jīvaka;
therefore in the fifth month the pregnant woman is beset with emaciation.
In the sixth month occurs the increase of strength, complexion, and vital essence; greater is the fatigue of the mother.
Complete with all bodily tissues and limbs, endowed with vāta, pitta, and kapha
in the seventh month, the pregnant woman is therefore constantly fatigued at this time.
In the eighth month, the pregnant woman and the embryo exchange between each other;
owing to its connection with the nutrient-carrying channels, it also shifts because of fullness;
therefore at that time the pregnant woman is faint one moment and gladdened the next;
and she meets with danger, so the eighth month is not counted [favourably].
In the ninth and following months, its birth occurs in due order.
The actions done in its previous body, and the joy and sorrow of dwelling in the womb,
the newborn remembers only as long as it does not enter upon its means of sustenance.
Thus spoke the blessed Kaśyapa.
Thus ends the chapter entitled 'The Non-Consanguineous' in the Section on the Body.