Another baby?

I've always wanted 3 kids. After having my first baby, I'm so unsure about everything. I certainly don't want 3, but thinking about having 2. I would probably be just fine with one, but I want my child to have a sibling. I'm TERRIFIED though. I'm terrified of feeling overwhelmed, of not being able to juggle both and give them enough attention. I'm scared my life will be too busy and chaotic. I'm scared my second baby won't be a good sleeper. My baby now, is such an easy going toddler, so I don't know why I feel this way.

For those of you that have more than one child, what are the pros and cons? Do you get to truly enjoy your children?