Young Robin

Good evening all,

We have a resident young robin in our garden but we are a little worried about him,  he has his red breast now so not too young,  but hes always puffed up so not sure if hes got mites,  up close he look like he has a hunch back ,  be looks so sad always, and he isn't very good at flying a bit too flappy ,  we've named him alan,  alan eats and drinks all day well enough but he just sits around watching the world go by him,    we dont want him to get hurt and he is safe in our garden but hes really quiet and sad looking,    any advise on how we can help alan is greatfully recieved , thanks