i'm definitely a minimalist mama, much more this time around than with my daughter. last time, it was my ex-husband who took over and did the Babys-R-Us registration, going around and making Star Trek phaser noises *rolls eyes* oh, i so much just wanted a Blessingway! but i appreciated every little thing we had. with co-sleeping and baby-wearing, it eliminates SO much of the things needed, really.
as a disabled mama one thing i really loved was a Bumbo seat (after 5 months), and an electric swing (not the wind-up kind). my girl's floor-time was mama's floor-time, i filled the floor with carpets and blankets, we had so much fun. as she got heavier in the wrap i had more trouble doing things at arm's length, she'd sit in the Bumbo seat so happily active while i was cooking or whatever, whereas she was passive and grumpy sitting/lying anywhere else. the electric swing was a healthy essential used properly, she had GERD at 3 weeks (it's congenital, my side) and whenever she was uncomfortable and wet-burping, i'd let her fall asleep in the swing and then i'd take her to bed or back in the wrap with me. her dad would leave her there all day while gaming if i was resting, sheesh.
my point is, the mom's list and the partner's list of things that are "necessary" might be totally different! be sure to communicate a LOT!