Political art?

Early start this morning - the beginning of a long and busy day. This morning I was looking at a vacant plot of land near Kilburn. This plot looks like it has been vacant since the last war. It's surrounded by a high brick wall with one wooden gate. Very much a secret garden.

The gate is pretty beaten up and in a state of disrepair but someone has gone to the trouble of painting or stencilling on this picture and the slogan.

I gather it is some sort of statement on the state of the world, but I'm not sure exactly what it all means. Any ideas anybody? Is it irony? Is it an anti - abortion issue? Is it a reminder that babies and children have rights?

Answers written lightly in pencil on a ten pound note would be most welcome.