I vaguely recall the parents chose too many traits (smart, attractive, etc.) for their genetically modified designer baby boy which they were warned could cause behavioral issues. The parents get him an android/robot guardian. Parents were also arguing a lot in the story. One of the arguments was about the designer traits they chose and the resulting behavior issues.
The android/robot guardian was a main character. I can't remember other plot details. I think they get in a fight with some other kids and the robot/android teaches the boy empathy.
I was read this story in the early 1990s in elementary school.