Learning how to interact socially is a difficult skill to master.
How to respond in a range of situations can be confusing. It is a complex skill. Difficulty often stems from immaturity in communication. It involves appropriate use of language, reading non-verbal cues, such as facial expressions and gestures and understanding the intonation of the human voice. All of these are important in social situations. Many children with developmental issues struggle with this and feel they have no friends.
It often causes considerable distress.
Also, there is one infant reflex that can cause difficulties with awareness of personal space. It can feel uncomfortable, or even threatening if a child approaches too close. This can make children shy away from contact.
Making and keeping friends is an important part of learning and maturing. The Brainchild Developmental Program is about releasing a child to mature.