I candled the eggs under my Silkie today because I expected more chicks to hatch after the 1st 2 chickies. Well, the chicks inside the eggs all look like they are moving about, but they don't all look at the same age of development. Is that normal? She will sit there and wait for the other chicks to hatch, right? Thanks in advance! This is my first time hatching chicks at all, so I appreciate any information I can get.