You can change an existing child support order if a substantial and continuing change in your or the other parent's circumstances has occurred since the court signed the original order. For example, you or the other parent might be making a lot more, or a lot less, money now than you were in the past.
You can also change a child support order if the original order does not address medical or dental support for the child or children.
Wait for the court's response to your Motion or Stipulation. You may be required to attend mediation and/or a hearing may be held.