The Compendium of Caraka 4.6.23

4.6.23

vyapagatapipāsābubhukṣastu khalu garbhaḥ paratantravṛttirmātaramāśritya vartayatyupasnehopasvedābhyāṃ garbhāśaye sadasadbhūtāṅgāvayavaḥ, tadanantaraṃ hyasya kaścillomakūpāyanairupasnehaḥ kaścinnābhināḍyayanaiḥ/

Devoid of thirst and hunger, dependent in its existence, relying on the mother, the embryo subsists in the womb by osmosis and sweating, its limbs and members being manifest and unmanifest; immediately thereafter, osmosis occurs in it partly through the pores of the body hair and partly through the channel of the umbilical cord.