Do you believe in the ‘leaps’?

I’m not sure if it’s because I have a 10 and 7 yr old but I tried following wonder weeks (the app) and just don’t really ‘believe’ I guess you’d say.

If my youngest is not sleeping, crabby or w.e I just think it’s because the mood she’s in and/or because she’s a baby. I don’t blame her crabbiness, neediness or lack of sleeping because she’s in a leap.

Just curious on your guys thoughts?