I think its the good old 'man as provider' that often swings into things.. they worry about the practical side of things even if they never put it that way.. its a guy thing.. plus they see things from a 'problem-solution' point of view.
My OH was very worried to about all those things until it became obvious that no amount of preparation is ever enough, and then his sister had kids and he was like ' i want one of them'...
Sadly i mc last month but he is now more determined than ever to become a dad and has totally forgotten about the worrying aspects of having a baby..
i know he'll worry again, as will I, but only when i get pg in which case it'll be much more appropriate!!
Good luck everyone!