They will sit in those swings for hours now -- I don't leave them in for hours but feel confident that if need be it could work!!! It's a miracle -- I have been able to vacuum not only the floors but the furniture. I have washed dishes, laundry, 2 bathrooms, sheets, thrown the frisbee for poor Rubi 2 days in a row, updated my blog 2 days in a row, etc........... I swore not to give unwarranted advice to pregnant women after all that I got during my pregnancy BUT as an exception I have to tell anyone who reads this that is pregnant, may become pregnant or knows anyone who is pregnant --- STOCK UP ON YOUR Ds!!!!!!!!!!!