Early detection and language training for the sibilants (S, Z, SCH), G, K and R from the age of 4 Words with these sounds cause the most pronunciation problems during early language acquisition. In this case, substitute sounds (e.g. D for G: fable instead of fork) are spoken or the sounds are formed incorrectly (e.g. lisping in the case of S with the tongue between the teeth). The exercises can be used by parents and caregivers of preschool children as a first aid for early detection of speech problems. After the correctly spoken sounds have been trained by speech and language therapy specialists, these sounds can then be practised playfully with individual words, sentences or texts together with parents/carers as therapists. In the case of speech difficulties, speech therapy should always be carried out with professional advice and support. To the editing of this exercise booklet.