There's pros and cons to close spacing and far spacing. If you space them farther apart, the older one is more independent and able to help. If you space them close, you get the diapers and stuff "over with" more quickly.

My 1st and 2nd were 3 3/4 years apart, so I didn't have to do as much for the older one. And, he pushed himself to be more independent (ie "I can dress myself--not like the BABY")

My 2nd and third were 2 1/2 years apart but it wasn't hard to have two in diapers. But I think diapers are easier than that first year of potty training. They are pals and they play together.

Now my youngest is almost five, and we haven't been able to have another yet, despite trying. But if we do, that will really be a gap! Good luck.