I had 23 months between DD1 and 2 then a four year gap between DD2 and DD3 then 25 months between DD3 and 4 and 19 months between DD4 and DS. I guess I didn't know any different so I just went with the flow, it can be hard running after them, literally speaking although I had PSD in various degrees with all my pregnancies. You'll be fine, it always amazes me how things just fit together,when it happens you'll be ready and fine and you'll have BB to fall on for advice, good luck!!!