Green’s Dictionary of Slang

1. (US) a child.

1837		‘Plunder Creek’ in Bentley’s Misc. Feb. 125: I some think that’s the tote, but four or five squeakers, squealers, younkers, whelps.
1851		Manchester Spy (NH) 4 Oct. n.p.: What did I get by it [i.e. marriage]? A jawing old woman, and three squealers.
1864, 1867, 1870		Hotten Sl. Dict. 244: Squealer, [...] an illegitimate baby.
1878		Sydney Once a Week Magazine 571: Darn me! if Jael didn’t put that there little squealer’s hands together, and hold them up as if she was making it say its prayers.
1908		‘Old Sleuth’ Dock Rats of N.Y. (2006) 22: The first thing I heard was the wail of an infant; and I tell you I was surprised, and entering the house I saw my wife with a lovely child in her arms, which she was feeding with a spoon. ‘Hello, Betsy,’ I yelled, where did you get that little squealer from?’.
1922		Joyce Ulysses 713: Kathleen Kearney and her lot of squealers.
1956		B. Behan Quare Fellow (1960) Act I: Scholara is nearly married to her. At least she had a squealer for him and he has to pay her money every week.
1979		‘Iceberg Slim’ Airtight Willie and Me 39: Them sweet words relating to your dead daughter [...] nearly got me bawling like a squealer.
1982		L.A. Times 8 Mar. n.p.: Sam is not like the sleazy dunnigans who work toilets, or the dips who grift with squealers.
2001		G. Coughlan Everyday Eng. and Sl. 🌐 Squealer (n): baby.

2. (Aus.) a promiscuous young woman.

1989

J. Morton Lowspeak 133: Squealer – 2. a young girl. See grunter.