1. Welcome to Flyertalk!
2. You've crossposted this to three different forums (Online Travel, Asia, and Mileage Run). Mods, you might want to close out the other two.
3. It would help if you told us:
a) what routing and price did you find online?
b) what routing and price did the agent give you?
c) is the infant in arms, or will the baby have his/her own seat?