"Happy Birthday" manages to hold its own and be entertaining at least. However, there were a few problems which prevent this episode from hitting the bullseye. The biggest flaw is the resolution of the investigation. I found the speech of the guilty party to be pure cornball. His rant about how a baby turns marriage into hell on Earth just did not work for me. The whole time I kept asking myself if he does feel that way, why did he not just get a vasectomy to ensure he would not have any more children? Overall, a good milestone episode.