question: My 18-month-old son started walking very early (10 months) and has always been a climber. During some of his adventures, he s has had some nasty falls. He ended up with a concussion back in December and had a clean cat scan, but was hospitalized overnight for observation. Now everyone he bumps his head, no matter how minor, he will get these noticeable knots/bumps. Should we be concerned about these bumps? He has some severe language delays (suspected apraxia).