Clinical Question: For children ages birth to 3 years diagnosed with a language delay or disorder, to what extent does the prosodic component of motherese aid in establishing joint attention (JA)? Method: Systematic Review. Study Sources: ASHA, Web of Science, CINAHL, MEDLINE, EBSCO, PubMed, PsycINFO, and ERIC. Search Terms: motherese, infant directed speech (IDS), child directed speech (CDS) AND parent child interaction OR joint attention OR engagement. Number of Included Studies: 4. Primary Results: Infants benefit from the use of motherese, including altered prosody and lexical content, to promote language development and engagement in JA. Conclusions: Motherese is a register used by mothers to gain attention with their children. JA is a pivotal skill used by infants to aid in communication. There is limited evidence that suggests a relation between the prosody used in motherese and infants' subsequent JA engagement. Further research is needed that specifically examines the prosodic aspects of motherese that are beneficial to language development.