Eleven-month-old babies generally cannot tell if they have autism, but if there is a lack of social interaction, impaired emotional communication, inability to form attachments, etc., there may be signs of autism, and the specifics should be confirmed by a doctor. 1. Lack of social interaction: This is mainly manifested by the baby’s lack of eye contact with others, lack of response to his or her own name, and failure to smile at parents or other primary caregivers. Under normal circumstances, babies at around 6 months of age develop the ability to interact socially. If the above symptoms appear in babies at 11 months of age, it is possible that there is a case of autism. 2. Emotional communication disorder: 11-month-old babies already have the ability to communicate emotionally and recognize the likes and dislikes of people around them. If the baby lacks the ability to communicate emotionally, is indifferent to the emotional changes of family members, and seems to have a gap with others, it may be a sign of autism. 3. Inability to form attachments: 11-month-old babies form attachments to their mothers or other primary caregivers, and show nervousness and anxiety when their mothers leave. However, babies with autism do not form attachments to their mothers and show no emotional changes when their mothers leave and return. It is important to note that the above symptoms alone do not clarify whether the baby is autistic or not, and it is recommended to seek prompt medical attention for a definitive diagnosis and active management.