This is the 13279th most frequent Swedish word.
tröstas
"Tröstas" means "to be comforted" in English.
In this sentence, 'tröstas' is used in its reflexive form, indicating that the child seeks comfort from their mother.
Barnet gick till sin mamma för att tröstas.
The child went to his mother to be comforted.
Here, 'tröstas' is used passively, signifying someone's inability to receive or benefit from comforting.
Efter den tuffa dagen kan jag inte tröstas.
After the tough day, I cannot be comforted.
In this usage, 'tröstas' is part of a subordinate clause denoting an intention or an expected result, meaning for someone to be comforted.