I had twins identical 8 months ago swelling went down alot in ankles but been having swollen ankles again past few months but not severe swelloing it goes off as soon i elevate feet what is the cause ?

Ankle edema: Swelling in the ankles that gets better with elevation is called edema. It is body water that has leaked out from the blood vessels and comes from having too much pressure on the vessels, blocked vessels, or too much fluid in the body. It can be caused by wearing tight elastic around your leg or calf. If you are, stop. It is not rare after pregnancy, but if it is getting worse, see a doctor.

Varies: Multiple potential causes including subtle cardiac, renal, pulmonary issue or even venous stasis disease, medication reactions, blood pressure issues, etc. a good medical checkup would be a good way to start.