Waste for me was the ergo. He hated it when he was young and as he got older it wasn't comfortable. Barely even used it! Guess DH was right.
Bouncer also. Micah vastly preferred his swing and the bouncer just ended up being a place for him to rest while I showered!
Hats...made him sweaty and hardly used, even during the winter. Same for most jackets.
Pacifiers - tried every brand under the sun, he always preferred the breast.
Best things:
Jumperoo, as it is all he is obsessed with since...5-6 months?
Baby bath tub as our sink isn't big enough, even for a newborn.
Easy swaddles - saved our lives many times.
SWING - CAN'T SAY IT ENOUGH! Only relief from colic!
His little seahorse - he loved it as a small baby.
And even though many don't use them anymore, we love our bumper. We didn't put one in until he knew how to roll very well/sit up though. Wouldn't risk it before that.
Newborn clothing was a must. He stayed in them until nearly 3 months! He was a small 6 lb baby though.