What are the pros & cons of having a second child?

My sister and I were 2.5 years apart and we have always been close. I now have a 7 month old and am 11 weeks pregnant with number 2 (a surprise) and I am scared, but also excited. My kids will always be clsoe in age to play together, I can teach them both things at the same time, etc... your daughter is old enough about having a baby sister/brother, so if you feel the time is right, go for it.