My daughter has done fine in school all the way up to the 3rd grade. She is now starting to fall behind in her grades and I am very concerned. Is a learning disability something that a child is born with or can it develop at a later age? Maybe she is just having a difficult time with her teacher and there is nothing wrong with her learning. I have tried talking to her about it, but she acts as if her grades are fine. Any advice would be appreciated.