Ds is 3, he's big for his age, not weight wise - he's sturdy but not overweight, but he's really tall. He's been complaining pretty consistently about pains in his legs for the last while. It seems to come and go in both legs and focused behind the knees. He's very active and we do a lot of walking so I did wonder about growing pains. He doesn't seem otherwise unwell, no limps or other sign of injury but he's just woke up to pee and has told me they're really, really sore again. It's becoming very regular as in every few days he mentions it. He does have a little turn in one foot which he's had since birth and they're waiting to see if it straightens out on its own but its never seemed to bother him.
Does this sound normal?