Hi S.,
This is normal for babies to sleep on and off and have good days and bad days where they don't get enough sleep. Are you a stay at home Mom? Sometimes babies could have gas, (even after you burp them), so try to burp your little one more to help settle his tummy. Is he eating good? Look in his mouth on the roof of it and see if there is a white film. If so, it could be thrush and he'll need an antibiotic for it because it is 'very' painful for babies. My son had that and it affected his sleep and he didn't drink his milk very well. Babies still love to be snuggled, as if they were still in the womb. So when he sleeps, try to swaddle him if he likes that, and or put some blankets around him (rolled up), to snuggle him while he sleeps. Babies love that. I learned that from my Mom. My son slept more when my Mom watched him than he did with us, and I noticed that she made his bed more snuggly and cozy as if he were still in the womb. :-) Also, you can try to put one of your shirts in with him so that your scent will be right there and he'll feel more secure as he sleeps. :-) Also, I have this book that I referenced to a lot called, "What To Expect The First Year". This book has a lot of great tips and advice for new Mom's. I also refered to "BabyCenter.com", and sometimes "BabyZone.com". More of BabyCenter. Their website is more user friendly. Best wishes to you and your family. G.