I am a 20 yr old that has had two babies. I first started having trouble with my hips when I was pregnant with my first baby. After I had him I would still ache every once in a while but it wasn't all the time. When I was pregnant with my second it started to get worse. Since I had my daughter in march my hips ache a few times a month. Today it started to get worse. It starts really deep in my hip and spreads to my knee and every once in a while I can feel it in my foot. It seems like it hurts the most when I sit. Does anyone know if there is a certain vitamin I should be taking to help prevent this?