Information on the formation of the R sound R is usually one of the last sounds that a child learns. This is partly due to the fact that its formation requires vibration and a very specific tense. The articulation of the consonant R often still causes problems for children of preschool age. In technical language, the difficulty in the formation of the sound R is called rhotacism. The speech disorder can occur in different forms: Examples 1. omission Oller instead of Roller Tommel instead of Drum 2. interchanges Lose instead of Rose Hing instead of Ring Up to the age of 4, problems with the phonation of the sound R correspond to quite normal speech development and are no cause for alarm. The only important thing at this time is that the child is able to distinguish the sound from other sounds. By the time the child enters school, he or she should be in Lag.