it is probably safe since it can be used on fingernails (which children often bite and chew). babies will do the same for their toes so i don't know if your baby does this or not. the paint is non-toxic but i think it would be a stretch to call this "healthy". the nail paint will not damage the nails or absorb into the body.
is it safe and healthy to paint babies toe nails? . are their nailbeds to soft and can absorb chemicals? will it damage their nails?