It's 5 months after a c section. Last 3 months I am facing knee pain while standing from a squat position. But since last one week the pain is increased. I am facing knee pain even after standing from a chair , or when I stand for long time. I take calcium supplement daily and vitamin D tablet once a week. I also take iron supplement as I am exclusively breastfeeding my child. I want to know the reason for this pain and what to do about it