D.G.
Check him at night, my son used to love to sleep with his foot between in the crib slats. He always worked out his foot himself, so if I hadnt checked on him at night, I may never have known. No matter how tightly I tucked the bumper he would manage to wriggle his foot under and poke it out the crib. Never had any kinds of marks, but I could see that maybe causing marks on both sides. Other than that, I'm baffled.