I have a seven year old who walks slightly pigeon-toed, but not enough that we (or his pediatrician) were worried about it. We just retired his latest pair of sneakers after 4 months of use. The left sneaker shows lots of wear on the outside rear side of the heel, while the right sneaker shows the same amount on the inside rear heel. To describe it another way, there is excessive wear on the left of each sneaker. Is this something that could indicate a problem? He has some coordination/neck/posture problems--none are normal, but not severe enough to seem like a severe problem. What do you think?