My daughter has 15 week old twins ( age adjusted to 8 weeks due to prematurity). It has been suggested that she leave a T shirt worn by herself or her husband in their cots if she leaves the babies in the care of anyone else, so that they can smell Mum and/or Dad. We all feel that this would not be a recommended practice as it means there would be loose items in the cot. Can you please comment on this? Thank you