Sounds very normal. You may run into the "4 month wakeful" here pretty soon where your LO only takes 30 minute naps. My LO used to take one 2 hour nap and then a few 1 hour naps. Then one day at about 3 months it all went out the window and for an entire month he would only take 30 minute naps no matter what I did. So just be prepared for that :)
Every baby naps differently. Whatever your baby does is normal just as long as he is getting the recommended amount of sleep in a 24 hour period.