I don't think it's possible to have 5 and five. By the time that happened, you'd have a hatchling grow up. Or you'd be scroll-locked with 4 hatchlings. You might be able to get 4 or 5 eggs, even with 4 hatchlings, but only by breeding. Hatchlings would have grown up before any of the eggs hatched though. The system has also had a major overhaul in the past few weeks, so the information that has been known for so long could easily be different now.
