Sucking
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): ( p. pr. & vb. n.) of Suck
(2): ( a.) Drawing milk from the mother or dam; hence, colloquially, young, inexperienced, as, a sucking infant; a sucking calf.
King James Dictionary [2]
Suck'Ing, ppr. Drawing with the mouth or with an instrument imbibing absorbing.