鳥の子

What does 鳥の子 mean in English?

1. bird's egg (esp. a chicken egg)(n)
2. chick; baby bird (esp. a baby chicken)(n)
3. eggshell-colored traditional Japanese paper made primarily of Diplomorpha sikokiana fibres (high-quality, glossy)(n)
4. eggshell (colour)(n)
5. red and white oval rice cakes(n)