What can cause colic? Is it because of trapped gas?

Like what Idza mentions, nobody is exactly sure what causes colic. Gas does seem to be one of the suspected causes. Other possible causes include: - baby’s growing digestive system with muscles that often spasm - hormones that cause stomach pain or fussy mood - oversensitivity or overstimulation due to light or noise - boby who is woody - baby’s nervous system is still developing Here’s an article with useful information on colic and suggestions on how to treat it, you may find this helpful: http://www.webmd.com/parenting/baby/what-is-colic