Write the following on a sizable paper.
Rub this paper on the abdomen in circular motion (Preferably anticlockwise) for 5 to 10 minutes daily once before going to bed and once after awakening in the morning.
Keep an eye on the size of the belly by measuring it daily. The tummy would start reducing from the very first day. When the abdomen returns to its normal shape stop this practice of rubbing.
If the paper gets torn during this time, dispose of it by burning and making a new one.