Quick answer
The officially named growth endpoints are Newborn and Elder. Growth continues while the dinosaur’s belly is more than half full; a complete intermediate-stage list is not yet confirmed by this wiki.
On this page
The two named endpoints
The developer describes raising tiny Newborns into huge Elders. That confirms the start and later form without establishing every label between them.
Keep the growth condition satisfied
Keep belly fullness above the halfway mark. Exactly half full does not meet the wording “over half full”; aim above that threshold.
Do not time growth from size alone
A total growth timer, intermediate thresholds and species-specific rates are not supplied in the public description. Follow the displayed stage and fullness in your own session.
Your next task
Choose the guide that matches the step you are working on next.