The average cost of raising a child born in 2013 up until age 18 for a middle-income family in the U.S. is approximately $245,340 (or $304,480, adjusted for projected inflation), according to the latest annual Cost of Raising A Child report from the U.S. Department of Agriculture.ack then, a middle-income family could have expected to spend $25,230 ($198,560 in 2013 dollars) to raise a child until the age of 18, according to the new report, which also notes that [h]ealth care expenses for a child have doubled as a percentage of total child-rearing costs during that time..