If your baby suffers from accumulated gas or colic try this simple massage . This will remove the gas and sometimes you can hear it too. I used to do this while massaging or changing nappy. If you still feel the baby is suffering from stomach pain you can try applying castor oil on their foot nails or belly button. This will remove the heat and baby will feel relaxed.
https://youtu.be/AJKcOGLWhYE
https://youtu.be/AJKcOGLWhYE