On the moral side, there may be good reasons to be an anti-natalist ("Better Never to Have Been"). I think it depends on the quality of life ahead. If the earth was a utopia, I'd be more interested in having a child.

A good personal reason to have a child, I think, is having an intense desire to have a child, and an intense desire to nurture and help your child grow into a good human being.

I give at least 10% of my income to cost-effective charities (see GiveWell.org for recommendations; see GivingWhatWeCan.org for a community of others doing the same). I think that's a better use of my money than taking care of one human being. I get more time for myself (no need to take care of my own children). I help in cost-effective ways to help the next generation live a better life; it's a good balance for me. Needless to say, having a child wouldn't conflict with giving to charity, but it's easier.