Sleeping Duration For Newborn

My baby was born a month earlier than his EDD which was supposedly in mid nov. As such, his adjusted age is 1 month plus now (corrected age is 0.5 month). Recently he has trouble falling and staying asleep in the daytime. No change to night routine where he will wake every 2 hrs. His total sleeping hours in one day i think is only ard 10 hours. However i unds that newborns are supposed to sleep 14 to 17 hrs. Would like to hear from other mummies/daddies how much ur newborns are sleeping.. Thanks!