Aww, congratulations sa baby mo! Ang umbilical granuloma talaga ay common lalo na after the stump falls off, kaya don't worry, pero definitely better to have your pedia check it out para sure, especially if may discharge or it looks angry/red, kasi sometimes kailangan ng proper treatment para mawala. Mine had something similar and the doc just monitored it, tapos eventually bumuo lang ng healthy skin on its own, but every baby is different kaya best to get peace of mind from your doctor.
JA