The young dragons are quite unstable in form during the hatching process, and generally, they are not affected by any external influence that causes a change in form unless someone forcibly breaks the shell, which can lead to developmental deformities.
The shell of a dragon egg is itself a strong filtering protection shell, which can basically filter out pollutants from the outside world. Even the blood of a Demigod poured over it would be filtered by the eggshell, with the dragon egg absorbing the beneficial parts.
However, this method also depends on the dragon egg itself. Ordinary dragon eggs may not withstand this influence, leading to abnormal changes in the young dragons that emerge from the shells.
Such situations are caused by external Divinity influence. If they are affected, it means that ordinary dragon eggs are not sufficient to filter out the parts of the Divinity that could influence the young dragon.