Maybe use something like Steam a Seam to bond some red hearts over the spots, then you can do a button hole stitch around them. If he's old enough, maybe even teach him how to button hole stitch to help you to repair it ?
Things happen...my toddler daughter once got ahold of my Grandmother's cookbook once and "wrote" me recipes in marker on a bunch of the pages, over some old, treasured recipes. 25 years later, I flip through that book and see my daughter's scribbling and treasure it, too!
Watson