Our 20 month old daughter has been complaining of back pain recently. When I ask her to show me where, she reaches back with her right hand, just above her waistline. A few weeks ago, she started screaming that her right knee hurt and she couldn t walk well on it for about 5 minutes. We noticed two unexplained small bruises, one on each side of her knee. Then this past week, we noticed a similar small bruise on her lower back. At this age, it s hard to know what is bothering her, but she really is very verbal for her age. She complains of back pain at various times - sometimes in her car seat, this morning when I came in to get her out of bed, other times just randomly throughout the day. Should we be concerned, and what do you recommend? We re not sure if it s her back or kidneys or a UTI or what. She s had a cold for the past 2 weeks, which developed into a double ear infection but other than that, no noticeable changes.