Limited research has suggested that risk factors for children having greater difficulties include poverty, pre-existing mental health difficulties, additional educational needs, and older age.
Mae rhywfaint o waith ymchwil yn awgrymu’r canlynol fel rhai o’r ffactorau sy’n creu risg fwy ymhlith plant: tlodi, anawsterau iechyd meddwl blaenorol ac anghenion addysgol ychwanegol.