What is the story on (commercially available) rusks? I had mother's group and they were the in thing. However, most of the women also measure how much their bub eats by what fraction of a jar they eat, cos why bother cooking when the baby may not like it

Are they needed for development?
Are they needed to be cool?
Are they used because the rest of food baby is getting is just mush?
Are they good for baby or just convenient?

ta