Cricket usually lays about five eggs, one every other day for ten days. And you still are quite a little snuggler. Okay, so the embryos inside the eggs develop for about 24 days. This system carries nutrition from the yolk and white of the egg to the developing chick. These blood vessels also carry oxygen which enters through the shell from outside.
Carbon dioxide is released through the same pores.
As the developing chick grows, the yolk decreases in size as it is absorbed. The liquid within the egg is also absorbed by the embryo. Liquid evaporates though the shell too. The chick breaks through into the air cell in the large end of the egg where it begins to breathe air through its lungs for the first time. This causes more spasms.