Should I still be swelling 6 months post abdominal lipo? (Photo)

Hello and thank you for posting photos along with your question. Although it can take swelling about 6-12 months to completely resolve it typically gets better with time and not worse. I can see a difference between your 4 month photos and the ones after and do see that you seem to be more distended. You should make an appointment to re-visit your plastic surgeon so he/she can determine whether there is anything besides normal swelling going on. I hope this helps and wish you the best of luck!Ankur Mehta MD

By six months after liposuction your surgical swelling should be resolved.  Your four month photo looks better than your six month photo.   
It's possible you have gained some weight, which appears to be intraabdominal. This means it is around your organs, not under the skin where it can be reached with liposuction.   You will know if you have gained weight. I would expect your weight to be down a bit after 5 L of liposuction.
Your description is also fitting with pregnancy, but you would know more details about this related to  yourself than I would.
I encourage you to follow up with your plastic surgeon to  have your abdomen examined to ensure there is no other reason unrelated to the liposuction that is causing the swelling.
Best of luck to you,
Dr. Nancy de Kleer

Majority of swelling should resolve by 6 months but some patients do have swelling that can take almost a year to fully resolve. Best to follow up with your plastic surgeon so you can be properly evaluated in person.