Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 20.62

20.62

yadi tvaṃ na pibeḥ stanyaṃ payo bālo mariṣyati /
śrūyate triṣu lokeṣu vedeṣu ca smṛtiṣvapi /
mucyate sarvapāpebhyo bhrūṇahatyā na muñcati //

"If you do not drink breast milk, the child will die; / it is heard in the three worlds, in the Vedas, and in the traditions: / one is freed from all sins, [but] the slaying of an embryo does not release [him].