My DS's were conceived during Aquarius (now I have that song in my head LOL) which is positive.
LOL - the exact same thing happened to me the other day!

I was thinking the same thing re: baby buddies. The only way it could be plausible is if we all had varying lengths in gestation - 37 weeks, 40 weeks, 42 weeks etc....and hence although genders were different, conception periods were different too. Unsure about the likelihood of that though!