Silly question - how do you know they are bored? My 2 are 6 months, but 3 corrected as they were 3 months early, and they are content to sit and watch the world go by. Or they watch their older brother race up and down the lounge.
Are they your 1st? or is it 1sts for plural???
Mine aren't into much at all, but I know Judy has 8? month old twins and I think Jody's are around the same age, so you may get a few more answers.
If you get a chance, hop over to the multiples board if you haven't already, there's a few of us there now.