Sprains affect your joints. Strains affect your muscles. Both usually occur after a fall or sudden movement that violently pulls or twists a part of your body. Chronic overuse of muscles or joints can also cause strains and sprains.
Coping with a colicky baby can be terribly difficult for parents. Remember that colic is common and it won't last forever. It starts at approximately 3 weeks of age and is usually gone by the time a baby is 3 months old.