My newborn is doing this too and it hurts to watch her go through it. She seems to go through it the same time every day, at around 7 am. What confuses me is why doesn't it happen any other times during the day? She spits up after eating every meal (breastfed) even after she is held upright for a half hour. Most of the time her spitup is clear but when she is straining it is thick and white. I have tried holding her legs up, the thermometer in the butt, rubbing her tummy, etc. Nothing seems to help.