Hi,
Unfortunately, my little one has been bottle fed from around 5 days old (breast reduction surgery, I could produce milk but couldn't get it out!!). I thought that would mean she'd get sick easier than the breastfed baby but that doesn't seem to have been the case. She's 7 1/2 mths now and hasn't even had the sniffles.
We go out almost everyday, she plays with my friend's kids and I go to the gym and put her in the childcare center there for 90mins 4 days a week.......ok, maybe one 1-4 days a week....hehe....but still she socialises! It's much cheaper too, only costs me $2 a pop and she loves it.
Anyway, I don't think it's madness as you put it, at the very least, even if she doesn't get sick it's good to socialise them, they love it. AND you'll get a break too!! I think our shopping centre also has a short time daycare, might be worth investigating that, you could put her in for a couple of hours 2 or 3 days a week?
smile