Ds is nearly 6 and I am concerned about some behaviours he has recently developed. He loves the Rainbow Fairies books and has discovered some YouTube videos of other children discussing their collections - lining up their books in order, explaining what they have and haven't got, talking about the fairies and their attributes etc. Ds has got obsessed with these videos and watches them as often as he can - screen time is limited, but more on a 'right that's enough' basis than strict timings. We are at the end of the two weeks holiday and he has spent every spare minute lining up his books, basically re-enacting these videos, replete with 'American' accents. We have been away for a few days and he was at his Dad's for a few days, and we have had a fair few outings, but at home has played with NO toys, refused offers to do craft (previously enjoyed), play boardgames (loved before) etc and can be heard reciting his books' title and lining them up at all times. He has played outside with his brother a fair bit, but it is awful how much time he has spent doing this. If it was a computer game I would be in no doubt that it was too much. He does read the books (independently) and discusses the plots etc a bit, but the majority of his time is spent lining them up and asking when I will buy him more.
Tonight it suddenly hit me and I felt overcome with, I don't know, a sense of depression at how limiting it is and told him the books are to stay on his shelf apart from when being read and he is banned from YT. I also said I would not be buying anymore of these books for a good long while. Is this too harsh/inadvisable? It was nearly bedtime, so no real impact today, but tomorrow will be hell if I stick to it.
He has always been a bit obsessive and had 'crazes' on things - Frozen ,wearing a princess dress everywhere - I stopped that, not due to an gender 'issues', but because I could sense it was becoming a 'crutch' and he couldn't leave the house without it. I had such crazes myself as a child and still do now, though obviously not as 'ferociously', but I am concerned at the lack of play. If he was mad about the fairies and spoke about them day and night and played fairies all day it would be fine, but the lining up concerns me.
If it is relevant he is in top groups at school where he also has perfect behaviour, is shy but does have friends and seems very happy overall. Does anyone have any advice please - I am very worried about him.