I have some really close gaps and two larger gaps.
dd1 - ds1 ~ 17 mths
ds1 - ds2 ~ 3yrs 10mths
ds2 - ds3 ~ 22 mths
ds3 - dd2 ~ 5yrs 8 mths
dd2 - dd3 ~ 11 mths
dd3 - ds4 ~ 13 mths

I really like a close age gap...my eldest two are still really close.
My last three are really close...I had three babies in 24 months.
I love that they will be close as they grow but I am not sure if i would recommend to have then so close...it is a lot of work.
dd2 is just getting TT during the day so up until now I have had three in full time nappies.
It can be hard going out with all three on my own...but you have to learn to manage.