Children in Wales have trialled approaches with babies (0-1 years old), toddlers (1-2 years old) and pre-schoolers (3-4 years old).
Mae Plant yng Nghymru wedi treialu dulliau gweithredu gyda babanod (0-1 oed), plant bach (1-2 oed) a phlant cyn oed ysgol (3-4 oed).