DS (2.7) has had a cough for a few weeks. He's been to the doc and it's just a cold no infections. He coughs for up to an hour at night keeping is all awake. MIL told me that him drinking milk will make the cough worse and I should cut out dairy until he's better. DS is a very fussy eater and most of what he eats is dairy based (cheese and yogurt). Is milk making a cough worse an old wives tale or is there any truth in it? The doc didn't mention anything about it. With both of us being tired and grumpy I don't want to deny him milk unless there's some evidence it will help. Thanks.