Pūtanā Rākṣasī’s heart was fierce and cruel, but she looked like a very affectionate mother. Thus she resembled a sharp sword in a soft sheath. Although seeing her within the room, Yaśodā and Rohiṇī, overwhelmed by her beauty, did not stop her, but remained silent because she treated the child like a mother.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तां तीक्ष्णचित्तामतिवामचेष्टितां वीक्ष्यान्तरा कोशपरिच्छदासिवत् । वरस्त्रियं तत्प्रभया च धर्षिते निरीक्षमाणे जननी ह्यतिष्ठताम्
tāṃ tīkṣṇacittāmativāmaceṣṭitāṃ vīkṣyāntarā kośaparicchadāsivat | varastriyaṃ tatprabhayā ca dharṣite nirīkṣamāṇe jananī hyatiṣṭhatām
SB 10.6.9