The objective of this study to determine the effect of surgical transversus abdominis plane block and local infiltration for postoperative pain control in major abdominal surgery compare with control group.

Most children experience postoperative pain after major abdominal surgery. They may have ineffective ventilation, following atelectasis and pneumonia if receive inadequate pain management. There are several methods used for pain relief such as epidural block, intravenous analgesia with local infiltration, transversus abdominis plane (TAP) block by ultrasound guided and surgical TAP block. Therefore, the investigators would like to compare the effectiveness of postoperative pain control with TAP block. However, TAP block in children need experience and ultrasound. The investigators decided to do surgical TAP block performing by inject from peritoneum point to skin instead.

Inclusion Criteria:

1. Age < 15 year
2. ASA I-III
3. Abdominal surgery : all upper abdomen and lower abdomen which would have midline incision
4. Elective surgery

Exclusion Criteria:

1. Allergic to Lidocaine or bupivacaine
2. Delayed development
3. Major abdominal surgery within 2 year