Need Excuse so that doc allows me to have ligation. I am only 23years old but already have 4kids! Thank you!

I think you can just speak to your doctor about it. Just that you have to be sure that you no longer wants any more children as the procedure is intended to be a permanent one. (you can find out more about the procedure here: http://www.kkh.com.sg/HealthPedia/Pages/BirthControlLaparoscopicBilateralTubalLigation.aspx) It is really your choice and I think if you are sure that having four children is enough, then I think that is reason enough.