During weeks 1-4 if you are on liquids/purees, the restriction won't kick in. You'll feel the restriction when you go on solids. This is why the Dr. suggested to limit the purees by volume, to avoid taking in a lot of cals. (And I guess to train me in the proper portion sizes for later)
After the surgery gas dissipated, I haven't experienced stomach pain. While eating or otherwise. Had some discomfort a couple of times when eating puree too fast (big spoonful, not waiting enough time in between)
This is more or less what I followed.
Week 1. Used a 2oz medicine cup. One every 10-15 minutes. More like 5 minutes toward the end. If too fast, would get stomach pain.
Week 2. Liquid diet, protein shakes, etc. I could drink a protein shake (12 oz), in about 30 mins. Just a sip at a time, no particular wait in between. 3-4 shakes per day.
Week 3 - 4. Pureed phase. 2 Shakes. 2 snacks. 2 meals (whatever protein was for lunch/dinner, pureed with salsa,broth or mayo). meals limited to 3 fl. oz. (~ 1/3 cup)
Week 5. Solids. Dr. suggested 2 shakes, 1-2 snacks, and 2 meals. Meals consisting of 4 oz total. 2 oz protein, 1oz vegs. and 1 oz carbs (optional).