babe, if you're bringing a baby to wedding dinner, better bring along a stroller.
for chi wedding, usually starts at 8pm till 11pm.. but if your baby is very cranky, mayb you can leave at 9+ or 10pm.. i seens some couple leaving at around 10pm cos their babies are cranky. i'm sure the couple will understand.
i think the part when a baby will be cranky should be the yum seng part, cos it's quite loud. mayb you can bring your baby out of the ballroom during that time? that's what my cousin did when she brought her baby to my wedding last time. but they stay thru out the dinner cos her baby was okay other then the yam seng part.. =)