Baby training is always interesting. But usually it's for a couple that's not quite a couple yet.
Changing many factors at once makes it harder to determine what exactly causes a change, but it's much faster to determine if any of those factors do have a significant effect.
Yeah, you so often see parents or people who believe that if a child cries it's someone's fault, but anyone with actual experience knows that they will cry for any reason, real or otherwise.