Oo, normal talaga especially pag natutulog lang sila, lalo na kung maliit pa lang ang airway nila! A few of us mums have noticed this sa aming newborns too, parang ang cute ng snoring haha, pero honestly it goes away as they grow. If it sounds like loud snoring or parang struggling to breathe siya, or if nakikita mo siyang parang gutom lagi or hindi siya lumalaki well, mas better to check with your pedia just to be sure walang nakablock or something. Congrats sa baby mo, BTW!