Okay yan normal naman lalo na if newborn pa lang siya, yan ang pattern talaga ng mga sanggol, tulog lang tapos gising para kumain! Ang 4-5 hours sleep at gabi ay actually good na, kaya siya comfortable at puno. I'd still check with your pedia though just to make sure baby's gaining weight properly and healthy, kasi bawat baby different ang rhythm, may friends naman ako na ganyan din babies nila pero some had feeding concerns na di nila napansin agad. As long as baby's alert pag gising, wet diapers okay, at satisfied after feeding, you're doing great!