A badly beaten 3-year-old boy was pronounced dead after he was dumped at a Brooklyn hospital Sunday morning — and police have now launched a manhunt for the tragic toddler’s parents, authorities said.
The heart-wrenching incident unfolded at 11:24 a.m., when police said they responded to reports of an unconscious person outside University Hospital at Downstate.
He was pronounced dead at the medical facility, an NYPD spokesperson said…