1. Emotional stability: Infants should be able to control their emotions, and will not cry excessively or lose their temper because of some trivial things.
2. Social skills: Babies should be able to establish contact with people around them, including parents, siblings and other caregivers. They should be able to express their needs and feelings, and make appropriate responses to others' reactions.
3. Self-care ability: Infants should be able to complete some basic self-care activities by themselves, such as eating, dressing and bathing. This helps them to build self-confidence and independence.
4. Curiosity: Infants should be curious about the things around them and like to explore new things. This is helpful to their cognitive development and learning ability.
5. Good sleep quality: Babies should have regular sleep time and good sleep quality. This is very important for their physical and brain development.
If parents find that infants have problems in the above aspects, they should seek professional help in time to ensure their mental health and development.