A birth presents many challenges. I am glad some people who know those challenges are not for them are forthright with their choice and may even serve as examples for others who will not care for or cannot measure up to the weighty commitment. Others who are going through the motions or might just have kids because they don't know any better, listen up. The rest of us, keep this in mind:
A birth, properly honored with about 20 years of attentive providence and worry balanced with a healthy degree of detachment, is or should be the repurposing of your DNA.
I spent so long thinking kids were their parents continuation. I hope the rest of my life manages to convey my gratitude to my kids for having taught me otherwise.