Useless things

There have been some useless purchases we have made since I was pregnant, for us anyways:
A sleep positioner that is supposed to prevent baby from rolling over while sleeping. As a newborn, Alex couldn't roll over, I'm not sure about other babies but she couldn't. She can certainly roll over now but they say that when a baby CAN roll over there's no real need to worry about it because they can roll themselves back and hold up their head. We never used it.
Her up-to-22 lb. infant car seat was sort of a waste of money, a 3-in-1 car seat is a better option. Although the infant car seat has been handy to take Alex in and out of the car and to carry her around, or to put it on her stroller.
A sleep sac in the summer, but I will probably make better use of it in the winter. Scratch mittens we never used, a nostril sucker that even Alex's doctor said is useless, I tried to use it when she was sick but it didn't work.
We registered for bumper pads at the beginning, until all the healthcare professionals we discussed them with told us we should not use them. Bumper pads have been suspected of causing SIDS because they prevent the air from flowing through the crib. Needless to say we quickly removed them from our registry. We recently purchased an airflow pad made by Jolly Jumper that wraps around her crib simply to keep her arms and legs from getting stuck between the bars.
Just some advice for new moms, pregnant women or anyone who is thinking of starting a family.