I LOVE LOVE LOVE having two!!!
Our kids are 3 years and 10 months apart and I think it is PERFECT! Jacob is really helpful and into totally different things than Celeste is into - so there is no jealousy - AT THIS POINT! I am sure once she starts getting mobile and going after his things it will be more difficult.
Jacob likes to be involved with caring for Celeste but we NEVER make him do the dirty stuff - changing or hauling diapers to the trash or anything like that. I want him to look at his sister as a fun companion - not a source of work!
My mom is an only child and has told me her whole life that if we have a child, do not raise that child alone without siblings. She had to experience her parents' deaths, and all the details that go with their deaths, alone. My older sister and I are really close, so I always knew we'd have at least 2.
Good luck with your choice. As a friend of mine told me recently (she just gave birth to #4!!) no one ever regrets having another child, but people sometimes regret NOT having another one.
