As child care costs soar , many Americans today find themselves paying more for a caregiver than they do for their monthly rent, according to a new analysis.  Child care costs for parents with two kids exceed rental costs in 85 of the country's largest metro areas, personal finance site  LendingTree found . In Omaha, Neb., Milwaukee, Wis., and Buffalo, N.Y., which have the highest child care costs in the country relative to local rents, families with an infant and a 4-year-old under care on