We will of course do this for the second kid :-). I think this will turn out to be not too much of a burden. I am sending a dozen medium-sized emails everyday already, what is a couple more for my children.
The upside is that the younger sibling gets the invaluable experience of a sibling from day one.
But regardless of what happens or doesn't happen between child 1 and child 2 in the case of the original poster, this is a great idea.