We loved it! It was me, DH, DS 10, DS 9 and DD 16mos. I will say that DD got antsy towards the end, maybe the last 15 minutes. She is by nature very calm and easy going though.
Both the boys name Cirque as one of the highlights of the entire trip. Ditto for DH and I. It held DD's attention for a while, then we resorted to snacks, lol. Your 3mo. I would think wouldn't be a problem at all, when they are that young you can usually take them anywhere. The 2yr is questionable. He may be enthralled, or he may get bored, it is a long time to sit still, though there is always more than one thing to look at. I'll bet your DD would absolutely love it though! Especially the little girls who throw up things that look like spools on a rope and catch them all different ways. That was our favorite part!