Vaishnava Samhita. Krishnadasa Charitam. Vol III Book VI Chp 18 Shlokas 25 - 26

तत्रैव भगवान् कृष्णःशङ्खचक्रगदाधरः |
चतुर्भुजो वासुदेवो रुक्मिणीप्राणवल्लभः || 
अत्र पूर्णं परं ब्रह्म श्रीकृष्णो नन्दनन्दनः |
द्विभुजो मुरलीधारी कैशोरेण विराजते ||

Only there Shri Krishna exhibits Himself as Shri Narayana with four arms wielding the conch, the disc and the gada. There alone Shri Bhagavan is seen as the son of Shri Vasudeva and the consort of Devi Rukmini. But here, Shri Krishna, the perfect and the Supreme Being mainifests Hiself as the son of Shri Nanda, a child with two hands playing on the flute.