A lot of parents need to chill out, and just enjoy their children. I have such a close bond with my son he is like part of me, so there is no stress having him around, just the joy of his companionship. With children there is not much that food, sleep and lots of cuddles don't solve. Parents scream at and hit their children, then wonder why the children are difficult. Try being kind and understanding and they react very differently. (Of course, there are some children that may have certain illnesses that this does not apply to, but comments on the link are more from parents that have little excuse for their attitude.)
There is no reason to "party" before you have a child, with some sort of attitude that life ends with parenthood. Ever since my son was an infant we have traveled the world together. If you are relaxed, so is the child. There is little I have not been able to do without taking Zac along. I still go to parties with my son, where he is the only child, because all my other friends that became parents just seemed to give up. My son loves my single friends and they love him. The main thing you cannot take a child to is a bar late at night, but there are grandparents, other parents and babysitters to help.
Children add so much to life, and it is a pity when some parents lose focus that they are the issue, not the children, for not being able arrange their lives to be better for having had them.