Lenny Pearce has carved out a powerful niche throwing these so-called “baby raves” across the world. What exactly are they? Well, they’re raves. For babies. Past security and inside the venue, everything glows. Flashing lights illuminate pint-sized tutu skirts, hair scrunchies and miniature cloud-shaped purses. Part Willy Wonka, part Vanilla Ice, Pearce — who DJs hourlong sets for audiences largely new to the world of solid foods — is rarely seen without his pair of ivory, rectangular sunglasses