Just went upstairs to check DD and when I moved her duvet I noticed that one of the buttons (10p size) was missing. Had a good search around the cot and floor and it's nowhere to be seen. 
There were no strange/choking noises thru the monitor earlier and shes sleeping peacefully now.
She may or may not have swallowed the button. Should I be concerned, or is this a wait and let nature take it's course (if indeed the button has been swallowed).
Toddlers eh??