My 3.5 month old son has been fighting a cough and congestion. We've been using a cool air humidifier and Vicks at night. At the beginning of the week he hadn't been sleeping well because he'd wake up coughing. The past few nights we put him in his bouncy seat inside his crib and he's slept all night long. My only concern is that I don't want him to become dependent on sleeping in his bouncy seat. Any suggestions?