Which preposition to use with infantile

in Occurrences 2%

As fast as the linen becomes damp, he replaces it with fresh, pressing the folds about us as tenderly as a mother arranges the drapery of her sleeping babe; for we, though of the stature of a man, are now infantile in our helpless happiness.

to Occurrences 1%

These people are like children, and exhibit their emotions in a manner which seems almost infantile to the Caucasian.

Which preposition to use with  infantile