Green’s Dictionary of Slang

baby adj.

small.

[Aus]Bulletin (Sydney) 19 Sept. 9/2: Their dresses are short, loose, white-embroidered ‘baby’ frocks reaching to the knee, and the famous red-stockings complete the costume.
[US]Ade Artie (1963) 10: I’ll try it, an’ if it do n’t go, it’s a baby risk.

In compounds

baby Benz (n.) [Benz n.]

(US black) the Mercedes Benz model 190E, which is small and sporty.

[US](con. 1982–6) T. Williams Cocaine Kids (1990) 87: She asked me whose baby Benz that was.
mbz.org [Internet] This list focuses on the ‘Baby Benz’ – the 190 (w201) series sedans produced from 1983–1993 – encompassing the 190, 190E (1.8, 2.0, 2.3, 2.6), 190D (2.0, 2.2, 2.5, & 2.5T), and 16valve (2.3–16, 2.5–16, Evo I, Evo II) variants.
baby bhang (n.) [SE bhang; the implication is of inferior potency]

(drugs) marijuana.

[UK]Daily Tel. (London) 30 Jan. n.p.: May I interest you in some Aunt Mary? Or perhaps a little baby bhang? No, I can see, you prefer El Diablito. Or bambalacha? Juju? Laughing weed? [...] or, let’s be perfectly clear, marijuana?
baby bio (n.) [pun on tradename Baby Bio + bi adj.]

a heterosexual man or woman who is experimenting with bisexuality.

www.rainbownetwork.com 27 June [Internet] ‘Yestergay’ and ‘Hasbian’ are the latest monikers following on from the queer trail of ‘Strays’ (straight men with gay sensibilities) and ‘Baby Bios’ (straight guys and gals experimenting with a little homo action).
baby butch (n.) [butch n.1 (6)]

(US gay) a young, boyish lesbian.

[US] (ref. to 1960s) B. Rodgers Queens’ Vernacular 24: baby butch (kwn NYC, les sl, mid–late ’60s) boyish, adolescent lesbian.
[US]P. Califia Macho Sluts 30: I should have struck up an acquaintance with that baby butch who harassed me about my walk.
[US]R. Scott Rebecca’s Dict. of Queer Sl. [Internet] baby butch — 1) a young butch 2) a lesbian of any age who acts or looks like a young butch.
[US]Time Out N.Y. (11th edn) 288–9: Let our gay glossary help you keep everyone...straight. BABY BUTCHES...
baby crew (n.) [crew n. (3)]

the junior member of a hooligan gang.

www.breakr-ring.de [Internet] Wild Baby Crew exists for already 2 years. We all started dancing at about the same time, someone earlier, someone later. [...] How we’ve got an idea of the crew? hmm.. It was announced that a b-boy jam is going to be held. We just wanted to take part as b-girls. And we did it.
Baby Crockett (n.)

see separate entry.

baby dreads (n.) [dread n.2 (5)]

(US black) a short version of the braided hair worn by Rastafarians.

Big Issue 21–27 Apr. n.p.: He is a whirlwind of windmilling arms, with baby dreads like demented antennae sticking out from his narrow face as he breakfasts with a crew of relatives and friends.
sirdrew.com 29 Jan. [Internet] Hair.... there was bald, low-cut, Erykah-Badu wrap style, tuques, Demolition-Man blonde, cornrows, baby dreads, medium dreads, afros, braids, down-to-the-floor dreads (I swear it was Jah), and one guy had Japanese cartoon hair (you know, straightened and sticking up at a 45 degree angle like Goku). That was all on guys BTW, in comparison the women’s imaginations were looking pretty limited.
baby gangster (n.)

(US black/teen) a gang member who has yet to commit a murder.

[Aus]Cypress Hill Sl. Gloss. [Internet] baby gangster: a gangbanger who didn’t kill a person yet.
Baby Jane (n.)

see separate entry.

baby life (n.) [life n. (1a)]

(US prison) the maximum sentence that prisoners must serve (six years, four months) before a parole board is bound to consider their case for the first time.

J. Atwood Too Much Time 32: Now l’m sitting here, with really what you call a baby life sentence.
baby pro (n.) [SE pro(stitute)] (US)

a prostitute under the age of legal consent.

[US]A.K. Shulman On the Stroll 112: Young pussy ought to draw the best; that was why he risked the dangers of baby-pro.

In phrases

pitch the baby card (v.)

(UK gambling) for a cheat to encourage a victim by betting and deliberately losing.

[UK]G. Smeeton Doings in London 40: The landlord and other men who are privy to the robbery, and ‘pitch the baby card’ (encourage the loser by sham betting) always come in for the ‘regulars’ (their share of the plunder). [Ibid.] The macer ‘pitched the baby card,’ and of course lost.