I think that our little ones have the right to have a
Toe Fetish !
Although, both of mine focused on Feet, there's not that much difference.
My young Female Becca, lays on my feet, brings her bones and chews
them (supporting their position) on my feet. My Male Sneakers did the
same thing when he was young.
In my opinion, it seems to be a matter of trust, a comfortable "companion"
or "place" for them to be. I don't mind it at all.