Deafness and Other Communication Disorders (NIH) (2022)
Link: https://www.nidcd.nih.gov/health/speech-and-language#6
Children vary in their development of speech and language skills. However, they follow a natural progression or timetable for mastering the skills of language. A checklist of milestones is shown for the normal development of speech and language skills in children from birth to 5 years of age.