Okay, well I have a baby who has apparently had it according to GP. But we didn't attend to get tested so it's only probable - but we had all the symptoms etc.
Anyway he was recovering from a major viral illness at the time so his immune system was pretty knackered. He was quite ill, but not as ill as he had been previously so we managed him at home.
We had to maintain his temperature at below 39 as he has a history of febrile fits (which are very scary to see but not generally harmful - think of it as a reboot for an overheated system). He was clearly in pain with his limbs and very tired. No food other than breastmilk went into him for eight days. He vomited a lot too. This went on for eight days followed by ten days and general malaise and extreme tiredness.
(you'd think I'd welcome this given he's never slept well ).
However, we are now what eight, ten (I don't remember) weeks further on and he's absolutely fine. Yes he's older than your babies would be, but bearing in mind he was a bit undercooked at birth and he'd had this big viral thing which hospitalised him previously, he came out of it very well - much better than I did.
If you do come into contact with this virus, and if you contract it - and this is by no means guaranteed given DH managed to avoid it despite all the rest of us getting it, keep your temperature down above all else, rest and stick with fluids. It's actually not as bad as regular seasonal flu which I had two years ago.
Also the flu season does not start in September AFAIK.
Practice good hygiene and chances are both you and your babies will be fine