J.R.
My son also only slept in short spurts at first -- 30-40 mins until almost 10-12 months if I recall. (He is now 18 months). There are different opinions about this....from Elizabeth Pantley to Penelope Leach. Some think they should try to sleep a bit longer and some thing that more 'wake' babies, well that is just their temperament for now. Check out Pantley's "No Cry Sleep or Nap Solution" for more information and/or ideas.
HTH.