Flower and Mouse are 6-ish weeks old now and getting along pretty well with Flickers. I have noticed that Flickers will nibble or lick the babies' ears and then Flower will do the same to Flicker later on. The pigs seem fine when the ear is being sucked on, but of course, it ends with a nibble. I am sure there is no real sucking, but their ears are in the other's mouth.