like most other ppls comments i agree that different ppl have very diff opinions on this. i am due Nov and will have a 20 month age gap. this was planned as we wanted them close. For me the reasoning behind this is i am alot closer to my Sisters (i have a twin and one who is 2 yr younger) than i am to my older sister (8 yr dif) We also thought while we still have all of our baby gear and still in practice now would be perfect. i know i will love this baby just as much and think of what i am giving my DD rather than what she will be missing. My husband also wanted this 2nd bub but now worries that he wont love it as much or the same way. on the other hand i have a close friend expecting the same time as me and her DD will be 5 she chose to wait so No 1 is at school and will be lots more help. It's def up to the individual but deep down you should know what you want. good luck in the decision making.