Edema, or swelling, below the belly button during pregnancy can be caused by several factors. The growing uterus puts pressure on blood vessels in the pelvic area, leading to fluid retention. Hormonal changes can also contribute to water retention. In most cases, this type of edema is normal and not dangerous. However, if you experience severe or sudden swelling accompanied by other symptoms like high blood pressure or headaches, it could be a sign of preeclampsia, a serious condition that requires medical attention. It's important to monitor your symptoms and consult with your healthcare provider if you have any concerns. To reduce edema, try elevating your legs when sitting or lying down, avoid standing for long periods of time, wear comfortable shoes, and stay hydrated. Gentle exercise like walking can also help improve circulation and reduce swelling.