Has anyone else explored this? And if so, have they been accurate in predicting leaps and new skills for your baby?

It looks like the “wonder weeks” posits that babies go through predictable developmental/cognitive leaps in addition to their physical growth spurts. The wonder weeks helps you to predict when your baby will go through these leaps and what skills you can expect to see. Also seems to predict that baby will go through a fussy period before the leaps and while the leaps are happening. I’ve noticed their calendar for my baby’s expected leaps do seem to line up with her mood as predicted. This is based in research by drs but I’m not sure how research-based and if this is widely accepted or just anecdotal and more for fun.