My child humps on objects

Moon, there is nothing wrong with this. Your child is probably what, 3 or 4 and it is quite natural to want to discover body functions. All children do this. Do nothing, just explain what body parts are for as much as they can comprehend at that age. These actions will go away over time and you absolutely cannot find fault with it, otherwise you are creating a bad thought process in the child's mind.

Medicine for calming down kids

It's perfectly normal. Sometimes kids are experimenting and find a certain thing that 'feels good'. They have no idea what about it feels good, or what it means, but they know that it feels good. There's nothing wrong with it and you should not make a big deal of it. It should dissapate as the child gets older.