For children with perforated appendix early appendectomy is better as children could return to routine activities like school and sports an average 6-days earlier.

The team studied the results of 131 patients below 18-years of age, who were diagnosed with appendicitis and a perforated appendix. 64 children were advised early appendectomy, while remaining 67 were advised interval appendectomy on random basis. The study revealed that in case of early appendectomy children could return to normal routine activities within 14days, while this duration was 19-days for children who were assigned for interval appendectomy. The chances of complications were 30% for early appendectomy and 55% for interval appendectomy.
However, chief of pediatric surgery at Cohen Children's Medical Center of New York, Dr. Steve Dolgin said, "The child with a perforated appendix requires treatment with antibiotics. The timing of an appendectomy does not need to be immediate. Some children with advanced appendicitis do better if they are treated with antibiotics and no operation during the acute illness. This new study does not answer this question (of when to operate) but adds to the debate. The best way to help children with appendicitis is to make the diagnosis early, before the appendix perforates."
Source-Medindia