C.F.
My sister-in-law has 4 children that ALL walked on their toes for at least 2 years. Like you said they had NO other issues. Her doctor wasn't concerned because it was something she herself had done as a child also. The kids are now 4, 6, 8, and 9 and very athletic normal kids. It never slowed them down, just something that that did. I have 4 children as well that never walked on their toes but one of them did crawl backwards only. Kids are all unique. Having said all that, I don't have any medical advice but you may find comfort in knowing my 4 nieces and nephews grew out of it on thier own. Have a great day!