If paying child support for a child and that child gets pregnant and has two children how much longer does child support have to be paid?

In most cases child support orders are enforced until the child reaches the age of majority, which in most states is 18. There are however, contributing factors in individual cases. The age may be specified in the original order, or it can be modified if the child is a student, or disabled, among other things. Consult the state of residency's emancipation laws. If that child dropped out of school that also matters check your state laws