One day, a year after Kṛṣṇa’s appearance, mother Yaśodā was patting her son on her lap. But suddenly she felt the child to be heavier than a mountain peak, and she could no longer bear His weight.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एकदाऽऽरोहमारूढं लालयन्ती सुतं सती । गरिमाणं शिशोर्वोढुं न सेहे गिरिकूटवत्
ekadā''rohamārūḍhaṃ lālayantī sutaṃ satī | garimāṇaṃ śiśorvoḍhuṃ na sehe girikūṭavat
SB 10.7.18