1. Begging behavior: Baby lovebirds will often beg for food by opening their mouths wide, chirping loudly, and flapping their wings. They may also stretch their necks and reach up towards the adult birds.
2. Nest activity: When baby lovebirds are hungry, they may become restless and start moving around the nest more than usual. They may also start to peck at the nest material or at the adult birds.
3. Vocalizations: Baby lovebirds may make a variety of vocalizations to express hunger, including chirping, squeaking, or screaming.
4. Weight loss: If baby lovebirds are not getting enough food, they may start to lose weight. This can be checked by weighing the birds regularly and monitoring their growth.
5. Body condition: Baby lovebirds that are hungry may have a thin, gaunt appearance. They may also have dull feathers and lack energy.
If you think that your baby lovebirds are hungry, it is important to offer them food as soon as possible. The best way to do this is to provide them with a variety of fresh foods, such as fruits, vegetables, and seeds. You should also offer them a source of water. If the baby lovebirds are still not eating, you should take them to a veterinarian for further evaluation.