Aiyoo, 45 hari pa, memang still very early lagi, sebab baby's airway masih kecil, kadang-kadang macam ada dengkur sikit tu normal jer, terutama kalau dia dalam posisi tertentu atau ada sedikit mucus. But since yours is quite loud dan lasting half an hour, better check dengan doctor jua, sebab sometimes bisa ada nasal congestion or reflux yang perlu sort out, one of my mum friends' baby ada gitu, turned out kena suction jer kat clinic. Just be safe, ya!