Aw babes, totally normal yan to worry! At 5 days old, it's common for the cord to start darkening and having a bit of smell as it dries out and prepares to fall off, usually takes 7-14 days depending on baby, so you're right on schedule. A few of us moms here had the same worry, and our pediatrician said as long as there's no redness, pus, or extreme swelling around the base, you're good; the smell is just part of the healing process. Just keep it clean and dry (fold diaper below the cord, avoid baths for now), and honestly, better safe than sorry, if you're still anxious or notice redness spreading, just call your OB or baby's pedia to give you peace of mind kasi alam mo naman, first time jitters are real! You're doing great, mama.