He will mostly likely to show other signs of discomfort, such as squirming around, pulling up his legs and clenching his fists. (newkidscenter.com)
Additionally, babies with colic like to be held and snuggled; back arching and other signs of discomfort could signal gastrointestinal problems. (howtoadult.com)
Side effects may include skin irritation such as redness, scratching or other signs of discomfort. (pet-lock.com)