If you have a nanny standing: Nanny stehen hast:

1. check if the nanny is activated/ the same goes for the feeding trough.

2. check if the nanny has enough food and the right food in the inventory.

3. check if the nanny is in the generator range

4. check if the nanny puts food into the dino the first time she feeds it! (sometimes the nanny bugs around)

If you don't have a nanny yet, your dino baby is probably starving.
Gachas basically starve if you go outside the render range as long as they are under 10%.