Sleeping a lot

My 5 months old baby has been sleeping a lot since birth. He sleeps through the night, and in the day he will take 1-2 naps that can stretch up to 3-4 hours per nap and then 2-3 30mins ish naps. Is that normal? His infant care teacher was shocked that he is sleeping this much. Sometimes I will have to dream feed him if it is way pass his feed time. He is bottle fed with ebm. Thanks!