Green’s Dictionary of Slang

a young child; also used affectionately or sarcastically, of an adult.

1965		J.P. Carstairs Concrete Kimono 246: Now perhaps you two kiddie-winks will kiss and make up.
1976		L. Dawson The Spy Who Came... 91: A small motor boat that was carrying ten little kiddy-winks.
2001		‘John le Carré’ Constant Gardener 475: ‘Wife well?’ ‘Gloria’s fine.’ ‘Kiddiwinks?’ ‘Fine.’.
2005		H. Mantel Beyond Black 289: I’ve told Michelle that gross poisoned worms are going to come and eat her kiddiewinks.