<noun> British slang
Male ejaculate, semen, penile ejecta, a bomb-load of
jizz.
Seeing as sperm is the cause of 99.9% of pregnancies - resulting in babies - it was only a matter of time before someone made the connection between sperm and babies and formed the phrase
Baby batter as a metaphor for come/
cum.
See also Baby Gravy
"
Jasper fired his 6oz load of
baby batter into Margaret's face, and she supped it up
like a glass of warm, creamy milk."