First, lets talk about the dangers of belly piercing. You could get it snagged in your clothing and that can be painful. It could get irritated and infected with sweat and other contaminants. When this happens, it takes a lot longer to heal and you want to avoid that, because navel piercings generally take a lot longer to heal than other body piercings.
Now how can you avoid the dangers of belly piercing? The first thing you must know is never ever try to do it at home by yourself! Next the shop where you get it pierced must be reputable and certified. The best way to get a belly piercing done is by a professional piercer who knows his job as this can avoid any mishaps.
You should make sure that all the piercing tools; needles, jewelry etc. are all prepackaged and pre-sterilized. If dirty needles or dirty equipment is used you could get an infection that can lead to quite serious consequences.
As it is, because of its location, belly piercings take a lot longer to heal and that could be irritating for some people. You want to be careful when you change your clothes because when you pull your top off, it can get caught in the fabric. When you put your shirt on, it can tear a bit.
In warm weather or while working out, we tend to sweat and this can get into a belly piercing and irritate it. So make sure you wash it thoroughly when you sweat into it.
When you get your belly piercing, choose your jewelry carefully. Your piercer can help you do this. Curved barbells are usually recommended as they lessen the chances of irritation. They do not move sideways or up and down as much as other jewelry in the piercing so that minimizes the chances of aggravating it.