My version

对于在去年迎来一位家庭新成员的中等收入美国家庭而言，未来17年里，他们花在这个孩子身上的花费可能是近30万美元。

For those American middle-class families who had a newborn baby last year, the cost of raising their child in the coming 17 years will be approximately US$300,000.