From Longman Dictionary of Contemporary Englishsucklesuck‧le /ˈsʌkəl/ verb 1 [transitive]HBHHBA to feed a baby or young animal with milk from the breast a sheep suckling her lamb2 [intransitive]HBHHBA if a baby or young animal suckles, it sucks milk from a breast → breast-feed, nurse→ See Verb table
Examples from the Corpus
suckle• Pups suckle for three to four weeks before gradually learning to go their own way.• Gozitan legend says that a giantess built the temples single-handed, suckling her baby at the same time.• On a bench a young woman with red hair had been suckling her baby.• For instance, an adult female will purr while suckling her kittens and when she courts a male.• But neither of these facts is of much relevance, for both apply to older children, not to suckling infants.• Suckling me where your mouth suckled?• It is the woman who conceives, bears, and suckles the child.Origin suckle (1300-1400) Probably from suckling 