I have never had any problems with babies waking my kids!!! Mind you they would both sleep through a bomb right outside their doors!!!

I would like to make one suggestion though ... would it be possible to move Jacob to a big boys room down the other end of the hall once the baby is big enough to sleep in the cot? Make it a huge occassion and a ccelebration of becoming a big brother???? I don't know if that is good for you, but as the babies came we moved the others further away!

Good luck in finding a solution.

Cheers