As far as the recommendation above, I would skip the high priced body mod care products. They don't give you anything you would not get by dissolving sea salt in hot water, and it's soooo much more expensive.
Navel piercings have some of the longest healing times and healing problem rates of all body piercings. Sadly, all the attention they get in the press tends to boost the perception of them as something you can go casually do.
My own navel took one and a half years to heal. I could not wear blue jeans for three years. It changed how I bathed, slept, dressed and dealt with stress. It flared up fresh monthly for a good year as part of my menstrual cycle. It grossed out relatives and made lovers uneasy.
However, a decade after the fact, I love it and live well with it.