I've seen some discussion this on other sites before, and I think it's interesting question.

First and foremost, I do believe morality is relative and evolves as we obtain knowledge and consider other perspectives.

When you consider the growing over-population around the world, and the negative implications that humanity has already had on our planet...

Like many philosophical questions, I'm not confident a simple yes/no answer.

@BlueWave: While I wouldn't consider your own children (if you have any) necessarily relevant to the question, as I'd presume it's more difficult to look at the answer objectively.
But yes, I have two kids, currently 13 and 10, I have full custody & provide for both of them in all aspects of life. Of course, I can provide for them a lot better now than I could 10 years ago. Additionally, their biological Mom had a child before my two kids, so I've already contributed to the over-population factor.