I think you will probably need more bottles. Cot would be whether you intend to co-sleep with the newborn and also depends on what is your current sleeping arrangement with your firstborn. If your firstborn is still using the rocker, you may also need to consider getting another one to avoid your firstborn from getting jealous that his/her things are being taken away.
Tandem strollers would be convenient in future if the need arises. But like what Vanessa mentioned, may be good to see how your children like being in the stroller.
Guess one important thing to get is a gift from the baby to his/her elder sibling. And also one from the elder one to the newborn.
All the best Mummy!!! Hope you can get as much rest as you can possibly get now!
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