Once your bundle of joy has started to crawl, no room will be safe any more, as your baby is now exploring the world by itself.
Fortunately, ABUS has thought of everything here too: doorstops, door dampers and window catches hold doors and windows open. This is a very good way to prevent trapped fingers or the door slamming shut due to a draught.
You turn around for a moment and your three-year-old has already opened the window. Prevent such moments of fright and simply close the window handle in a child-proof way.