This verse from Srimad-Bhagavatam (10.8.13) was spoken by Garga Muni when he was performing the rituals at Lord Krsna's name-giving ceremony. He states that the incarnations of the Lord in other ages had been white, red and yellow. This yellow color refers to Sri Caitanya Mahaprabhu, whose bodily complexion was yellowish. This confirms that in the past Kali-yugas, the Lord also had incarnated in a body that was yellow in hue. It is understood that the Lord incarnates in different colors for the different yugas (Satya, Treta, Dvapara and Kali). Accepting the color yellow (pita), as well as other characteristics, the Lord incarnated as Sri Caitanya Mahaprabhu. This is the verdict of all Vedic authorities.