According to the Americans with Disabilities Act of 1990, the definition of a disability is "...a physical or mental impairment that substantially limits a major life activity."
Child rearing is one of the most natural of life activities. For individuals who were born without the ability to reproduce, laws and rules have made it more difficult that those who are fertile. To limit people in wanting to adopt a child can cost $40,000+, after medical and adoption expenses.
With proper medical documentation, the total expenses of certified medical exams and the adoption incurred for infertile people should be no more than the cost of an average birth in the United States and infringes on the inalienable right of the pursuit of happiness.