Since the original cost of 233,610 only covers the first 17 years, this assumes the child becomes financially independent and moves out of the house at this age. But for most people, this is not the case. Nowadays people are having to go to college to get a degree so that they are able to support them self in the future. And  the parents most likely will help them pay for this to some extent.  The price of colleges can go anywhere from 50 to 100 thousand for four years.