On a different (non-baby) forum, there is a person with a reletive who is currently giving there under 2 yr old Benylin 6yrs+ to help the baby sleep at night.
The response from said relative to that they should not be doing that is that "they can't see it will do any harm and the child to sleep".
To give said person some ammunition, what would be the health implications of giving their child Benylin 6+?