I have 2 kids, I was 18 and 23 when I had them, and got my tubes tied when #2 was born. I don't think it's selfish to not have more kids because you want to maintain a certain life style for you and your existing children, I think it's selfish to have children when you know you can't provide or care for them emotionally. My 1st child is disabled and we always thought he'd be an only child, but then decided to try for #2 and required fertility treatment to conceive. I'm so blessed to have the kids that I do, And we've made the decision to not have more, even though sometimes I'd think I'd like to, I know it's not what's best for my family. I think it no one's business how many children someone chooses to have whether it's 0 or15, as long as they're properly cared for. I think everyone can agreee it's heartbreaking to see a child who's not being financially cared for, or loved. And as far as an only child being lonely, that's what parents, extened family, and friends are for.