M.D.
One of mine had this. Keeping them trimmed is obviously essential. Beyond that, we put him in open-toe sandals in the summer as a baby. They were the kind that strapped across the instep and around the ankle so that they were secure and easy to walk in, but with lots of toe space.
ETA: Yes Jill, you can get wide width toddler shoes, and those are essential in the winter.