It's a normal behaviour in most of the children nowadays.
But sometimes it may be seen in some conditions like autistic disorder.
To confirm autistic disorder, you need to consult a child psychiatrist or pediatrician .
To say autistic disorder,, the following symptoms should be present.
1. Lack of social interaction
2.failure to develop peer relationships
3. Lack of sharing enjoyment and emotions
4. Lack of language / communication skills
5. Repetitive use of same language/ words
6.not interested in spontaneous/ group playing
Next Steps
this is for your information, plz don't come to any diagnosis without pediatrics/psychiatrist consultation.