I am amazed at the lack of parenting skill and even more amazed at the people bashing people who are asking for help. My kids fall/bump heads 20 times a day. They are 11 month old twin boys who are walking all over the house. We are good/attentive parents but sometimes they get away and hit their heads, it happens.
Those of you who are asking, if you baby is not acting right, take them to a doctor. They can give you much more medically credible advice than people on this site.
Those of you who are bashing the people asking questions, go teach somebody how to do it right and quit wasting time beating people up. Those of us who know are responsible to teach those who do not. Asking people if they have lost their minds is not teaching, it is ranting and/or just hateful talk that serves no rational purpose. Maybe a couple of you need to hit your heads.