Yes, yes yes. When we allow others to limit our options by imposing their perceived restrictions, they can make it whatever they want the answer to be. A baby by some of the restriction given wouldn't have a birthday if they were born by Cesarean Section. Those children born on Feb. 29Th would have a birthday only once every four years. You couldn't count the three years in between.
I was just reading that an Elephant by some restrictions of having to have so many feet off the ground at a given time aren't running. When I saw pictures of Elephants charging, no one can convince me they aren't running.
In some Asian cultures, I think Chinese, the babies birthday is at conception. Catholic dogma also says the baby has a soul at conception. The baby's birthday should be then, like the Chinese?
To extend your question one step further, They may be entitled to three birthdays is you allow my logic. They would have a birthday at conception. They could have one at the time the egg is laid. The third and final birthday would be the day they hatch.
The mother bird lays an egg and doesn't start incubation. She lays the second egg and doesn't start incubation. Only when the last egg is laid does she start the incubation. There can be a dozen or more eggs in the clutch. Once she begins to"set." All the eggs that are laid begin to develop. This way all the eggs hatch at the same time or at least nearly all on the same day or less than a day apart. Is the first laid egg's nestling 11 days older than the last one laid even if they hatch in the same hour?
You see what I mean about restricting the question to specific criteria? You asked the question. You get to eliminate their restrictions. You are thinking outside the box. They are stuck in their rut of parroting other's ideas. Stick to your own thoughts. Don't be bullied by bigots.