Visitor insurance is available to children over the age of 14 days. The children can be together on a plan if atleast 1 parent is applying for the visitor medical insurance. Some visitor medical insurance plans offer free coverage for a child if the parent purchases coverage.
In the event the parent does not need coverage, you can purchase coverage only for the children using a child only rate. You must purchase 2 separate visitor health insurance plans, one for each child. The plans do not allow for 2 children to be on the same plan without an adult.