CC Ādi 2.98
bālya paugaṇḍa dharma dui ta’ prakāra
The vilāsa forms are six in number. Incarnations are of two varieties, namely śakty-āveśa (empowered) and aṁśāveśa (partial). These incarnations also come within the category of prābhava and vaibhava manifestations. Childhood and boyhood are two special features of the Personality of Godhead Śrī Kṛṣṇa, but His permanent feature is His eternal form as an adolescent youth. The original Personality of Godhead Śrī Kṛṣṇa is always worshiped in this eternal adolescent form.