For receiving Supplemental Security Income benefits or SSI for child, a "child" is defined as an unmarried person who is not the head of a household, is under the age of 18, or under age 22 and regular attending school. To qualify for SSI, the child must be either blind or disabled. An eligible child may qualify to receive benefits beginning at birth, or at any age thereafter until the child reaches 18. Upon the child's 18th birthday, the medical need for benefits is reevaluated.