Middle-class Americans tend to lead "child-centric" lives, for better or worse. I think it is often overdone.
I happen to believe that "happiness," however defined, is not necessarily a valid goal in life. Many things are more important. However, moments of joy are always welcome. I am grateful to my parents for having produced and nurtured me. Glad they had sex that winter day. Whether I produced more pleasure or pain for them, I have no idea and would never ask.
The article: Do Children Make Us Happy?