Srimad-Bhagavatam: Canto 1 - Chapter 1 - Verse 8
Sanskrit:
अङ्गुष्ठमात्रममलं स्फुरत्पुरटमौलिनम् ।अपीव्यदर्शनं श्यामं तडिद्वाससमच्युतम् ॥ ८ ॥
ITRANS:
aṅguṣṭha-mātram amalaṁsphurat-puraṭa-maulinamapīvya-darśanaṁ śyāmaṁtaḍid vāsasam acyutam
Translation:
He [the Lord] was only thumb high, but He was all transcendental. He had a very beautiful, blackish, infallible body, and He wore a dress of lightning yellow and a helmet of blazing gold. Thus He was seen by the child.