Definitely a sling, it doesn't matter which sort just make sure you have one.

We had this little yellow duck that you float in the bath and it says the correct water temperature or if it's too hot/too cold. This lead to a happy munchkin at bath times.

Phone number of your nearest ABA breastfeeding counsellor!

A rocker, good for rocking baby with your foot while you eat tea.

A microwave - for reheating tea when it has gone cold (again!) While we're on the whitegoods make sure you have a clothesdryer too, esp for winter babies LOL