My almost 6 month old baby fell out the bed onto concrete floor the fall was no more then 2 -3 feet from the ?

Bed he cried for about 1 minute %26amp; played as normal for a hour he ate %26amp; went to sleep.He seems to be as normal as usually but I'm concerned with what could be going on in the inside. What should I do?My almost 6 month old baby fell out the bed onto concrete floor the fall was no more then 2 -3 feet from the ?
he will be fine ,