As soon as the new egg is laid, it begins to harden. Cricket begins to sit on her eggs as soon as they are laid. That means that the embryo continues to develop because she keeps the egg at her body temperature. Some bird mommies wait until all the eggs are laid before beginning to sit on them. That means that the first ones to be laid stop developing while the other eggs are laid beside it.
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.