My wife is a kindergarten teacher (in Sweden it requires a bachelor’s degree, so it’s an actual thing) and one of the things she has kept bringing up during her time at uni is that you have to explain why. Just saying “stop”, “no”, “yes” etc teaches them nothing. What is obvious to us is unknown to them. Explain why and they’ll be empathetic back.

I thought this was the best thing since sliced bread too. Then he learned he has arms and can use them to roll around, which means you have to stop swaddling. A week or two of bad nights later he’s now sleeping without one.