I'm not a fan of CIO at this age, but I do let him cry for 3 minutes before I pick him up...sometimes longer if I'm pooping or showering.
I do think CIO is fine for older babies, maybe around 6 months or so. Ask me then...haha.
As for wearing the baby, while I know its not done in daycares, its a practice thats done worldwide, Africa, asia, south america. 3rd world countries have to keep working when they have babies and they have to "wear" them. So to me, it seems like a natural thing to do and I don't think I'm spoiling him. I will ball my eyes out when he goes to daycare and will not be worn. Our country is all about independence and less about family and nuturing and I think thats kind of backwards.