What part of the world are you in? Is there another word you use for the baby chair used at the dinner table for eating? It's high off the ground?

Your bub will learn to accept things like the carrier and be left alone for short periods if you are consistent. I find sometimes DD might whinge when I first put her down, but if there are a few interesting toys on the floor with her, and if I keep talking while she can't see me, she will quickly stop whinging. I don't leave her to cry and get distressed, but there's a difference between a distressed cry and a whinging cry.