Learned some hard lessons this trip.
1. Pattaya Passport Office now on 3rd floor (at the elevator) and limits to 260 a day
2. You can go on-line to get in the queue, but is limited to 40 a day (and was full this week)
3. When you renew your child's passport it is the same as getting new, need the same documents (e.g., Birth Certificate, House book, both parents, Falang Passport).
Went by this morning at 0630 and people were in line (Opens 0830). Yesterday we arrived 0800 and were done by 1030. However, understand they offer the 1st five to volunteer expedited service for an extra 1000 baht or so. Passport cost is still 1040 baht.