Belly button piercing is a month old and started getting brown crusties, is it infected?

My belly button piercing is a month old and it's still reddish-pink around the top. It's getting a bit crusty on the top which I think is normal but today, the crust on the bottom hole was brownish and it smells bad. It's not a lot of brown discharge but it's just a bit. If I push the piercing down slightly, there is a tiny bit of discharge on the piercing hole but not a lot. I clean it with salt water once or twice a day on top of showering every day. Any idea what's up?