How?
No interaction with any other child except siblings for a full 6 months.
Then again, later for months again.
Uni without going to campus for a full year.
No socialising, no trips, no sleepovers, no soft play (closed well over a year), no indoor activities.
No holidays, no birthday parties, no day trips. No fun.
All are left more introverted, cautious, less social than the children they were before.