This is a common issue and one that really needs to be addressed....and soon. many parents think that if their baby sleeps through the night that they do not needs naps. Farthest thing from the truth. Kids need anywhere from 3-5 extra hours of sleep during the day in addition to a full sleep-cycle at night. It is imperitive for their developmental, emotional, and physical growth. I had a child who did this same thing and we had no choice but to grab the bull by the horns and sleep train her. Sleep is a learned response, not a natural one. People sleep in a circadian rhythm unless molded by our surroundings. The parents of a baby have to decide on the sleep times and the nap times....not the baby! I have a great book for you....Healthy Sleep Habits, Happy Child by Dr. Marc Weissbluth. GET THIS!!! Not only will you see yourself and your situation through the eyes of the other parents who describe their stories in the book, but you will also get a look into what can happen if you let the little non-napper keep going this way. It is a nightmare that you don't want! TRUST ME!! I bought this book and read the whole thing in 2 days. I then sleep trained my youngest daughter by the method in the book and we were done in a week. Rough week....but we did it. She went to bed at 8:00 and slept till 6:30 am. The she took two naps every day....9:30-11:00 and 2:00 to 4:00. It was a dream come true. I got a much needed break and she thrived and grew into a terrific sleeper that knows her limits and respects her body's need for rest. My little "non-napper" is now a vibrant 13 year old and I owe my sleep training talents to the book and Dr. Weissbluth. This worked so well that I just sleep trained my brothers new baby. She is 3 months old and sleeps from 8:00-7:00 every night clean through. Now we have to work on her naps. Please do this. You are in the perfect zone because your baby is young and will respond beautifully to this method. Just dig-deep, read that book, and BE STRONG!! Your rest and your baby's health depend on it!