One of my friends just told me there this old wives tale. (She's Asian so maybe an Asian old wives tale?)

If your baby sucks their thumb they prefer dad.

If you baby sucks their index finger they prefer mom.

It is unknown what sucking any of the other fingers mean or if they don’t suck anything on their hands means.

Have any of you found this to be the least bit true?

Would also like to hear from ex-thumb/finger suckers which parent you preferred when you were younger. ^_^