I'm posting this as I had some bad experience with my 2-year-old baby. She always runs here and there and will hit her head somewhere near the window sills or so. Alas!! Then will start the cry. Well, almost all kids will be super energetic during their ages of 2-5.Managing them is difficult I know.So,my little tips are : Try to spend more time with them and observe what they like and don't like to do. They’ll never sit idly So make your rooms free for them to play. Avoid all the situations that can harm them.Make sure your windows are childproof. You can also visit this. [ http://northtechwindows.ca/2016/10/10/how-to-childproof-your-windows/ ] You can adopt for any window wedges,charley bars,window guards etc depending on the type of your windows and doors.Do not allow them to go to the stairs alone as they may fall. Also, make sure exterior doors are always closed. Not to worry much.Enjoy their golden years.