Bhakti-rasāmṛta-sindhu .1.320
atha madhyamam –
[atha madhyamam –]
ūru-dvayasya bāhvoś ca kāpi śrīr urasas tathā |
[ooru-dvayasya baahvosh cha kaapi shreer urasas tathaa |]
mūrter mādhurimādyaṁ ca kaiśore sati madhyame ||320||
[moorter maadhurimaadyam cha kaishore sati madhyame ||320||]
Blended reading (Sanskrit + English inline)
atha madhyamam –
ūru-dvayasya bāhvoś ca kāpi śrīr urasas tathā |
mūrter mādhurimādyaṁ ca kaiśore sati madhyame ||320||
During the middle period of the kaiśora period, Kṛṣṇa displays indescribable beauty in His two thighs, His two arms and His chest, and sweetness in His whole form.
Purport
When Kṛṣṇa arrived at the age of thirteen to fourteen years, His two arms and chest assumed an unspeakable beauty, and His whole form became simply enchanting.
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io