It depends on why you were only at those jobs for a short time. If they were travel assignments or temporary positions, then it's fine to include them because they were meant to be short term.
The problem with a string of short-term jobs (that aren't meant to be short term) is that it makes the employer ask why you left so soon. Did you have trouble getting along with co-workers? Were you consistently late? Were you fired for some reason? Are you a job-hopper? It gives the employer no confidence that you'll stay with them for a long period of time.
It also depends on what kind of jobs they are. If these are nursing jobs
, then you might want to include them because they show experience. But if they are jobs in unrelated fields then the probably won't enhance your resume too much anyway and it's best to leave them out.