Newborn sleep hours

Hello momshies! Just wanna know kung may mga same exp dito regarding baby's short total hours of sleep. He averages just around 12-13hrs total in a day (24hrs). According sa mga nababasa naming articles, newborns typically sleep a total of 15-17hrs. He just turned 4 weeks today and nababahala lang kami if he's getting the right amount of sleep. #sleep