Climbing through the windows

My one year old has made it a hobby to climb through the new casement windows that we have installed ( http://www.heritagehomedesign.ca/windows/heritage… ). We are planning to add grills to the windows but it'll take time. How can I stop him from doing this.

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About KarLop
Birth: December 31
On Moms.com since: Jul 26, 2016
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