A window restrictor, that’s what.
Horrible as it is to think about, young children can fall out of windows. So Sandwell Council, various landlord organisations and the Royal Society for the Prevention of Accidents, (RoSPA) all recommend you fit restrictors where children sleep. But this isn’t just a recommendation. It is also a legal requirement under the 2004 Housing Act to fit these on all windows on first floor and above in rented accomodation.
Sadly, real tragedies which should have been easy to prevent still happen because people aren’t fitting restrictors, despite the fact that doing so is very cheap, quick and easy (and obligatory!).
So, if you are a landlord whose tenants have children, (or perhaps you have your own at home), please do think about whether you should be fitting restrictors. Just one point to bear in mind; RoSPA recommend avoiding those that have keys. Keys get lost. If there was a fire, that could have serious consequences. The good news though is that there are plenty of easily available alternative types which use child proof catches instead. If in doubt, do please look at the RoSPA website.