1, Sleep: Young birds sleep most of the time during the breeding season, so they may just rest.
2. Development: Young birds' eyes may not be fully developed and need more time to develop and grow.
3. Diseases: Some diseases can cause young birds' eyes to be moist and unwilling to open their eyes, such as keratitis, conjunctivitis and other eye infections.
4, poor diet: improper diet may lead to the deterioration of the health of young birds, including eye problems.