Recently my DS has been coughing a lot - but I can't work out if it's a real cough or just a new sound that he's discovered and is trying out. The cough doesn't sound bad - it sounds just like if you were to do a fake cough, but he is doing it quite a bit. He hasn't been sick (he's never been sick), so if he does have a cough I'm not sure where it came from. Do babies do this? Discover that noise and try it out? He doesn't seem unwell, I just want to make sure nothing bad is going on.