hello doctor my son was sleeping in noon time, but when he woke up, he had pain in his both knees. he was crying after some time he was normal but after some time he had again pain in his knees and he cried a lot. nhe is standing , walking normally. i touched his legs, but that time, there was no pain. but suddenly, after some time, he is having pain, but after some time, he is normal. I can't understand why he is having pain in his both knees. pls suggest me.