Am I crazy?!

So right now I have a almost 3 month old and I just told my husband that in December  I want to start trying for another baby. I want my babies close in age.. I have a sister and she's 8 years younger then I am and were not close because of the huge age gap and I've always envied people who had siblings 1-2 years older then them! Am I nuts for wanting another baby so soon?!! lol