in putting a warm (not hot) water bottle in my toddler's cotbed?

[loveroflife]

Ds (2.5) sleeps in a room that is not particularly warm - would it be OK to put a warm hot water bottle in his grobag as the evenings are getting colder or is this a stupid idea?

I love one in winter and he's pretty responsible in that if I explained that it was to keep him warm and not to open it etc, he would understand and not mess about with it.

I have a warm (not boiling) water scar on my leg it is large it used to cover all of my stomach and most of my thigh, though has faded significantly with age. I accidentally tipped a bowl of water onto my lap, I ran straight for the shower and then went to a&e covered in bags of frozen peas.

Please just put him a warmer gro bag.