According to the article, it is difficult to diagnose babies/kids/toddlers because "[...] they can’t speak”. The article also mentions that the kid didn't have

According to the article, it is difficult to diagnose babies/kids/toddlers because "[...] they can’t speak”. The article also mentions that the kid didn't have the symptoms or physical manifestations of spina bifida, complicating the diagnosis. This case reads as a genuinely difficult case to diagnose.