subs. (colloquial).A baby.
1622. FLETCHER, The Spanish Curate, i. 3.
| Hen. Tis the curse | |
| Of great estates to want those PLEDGES which | |
| The poor are happy in. | 
1751. SMOLLETT, Peregrine Pickle (1895), iii. 122. In a few hours a living PLEDGE of my love and indiscretion saw the light.
Verb. (Winchester School).To give away. PLEDGE ME = After you; Ill PLEDGE it you when I have done with it: cf. POSTE TE.