manufacturing defect or bad luck

I have buy this play there one month and I am disappointed that the seam of the inside strand is already let go especially knowing that my daughter didnt than 2 year and not even weighs 15 kl and besides the castle has never served the outside so we can not say that the degradation that comes from the time he made out .In the meantime I end up with a play that my dear listen to the little use that he made, I do not know if this is a default on some items but the strength is really goodbye and now I will think twice before recommending on the internet because very disappointed