The broadband developmental screening now recommended by the American Academy of Pediatrics for all children at 9, 18, and 30 months includes language milestones or parental concern, but these have not been shown to have adequate sensitivity or specificity and will miss many affected children.
Many young children with language disorders are now or will later be on the autism spectrum. The recommended autism-specific screens at 18 and 24-30 months will detect many, but not all, of these children. It is important to realize that the most common reason for a false positive autism screen is language delay, and it deserves follow-up and treatment even though not representing autism.
What should you do given these gaps between need, tools, and knowledge? Of course, collect the general and autism screens as recommended, but also use them when you or the parent have a concern. For children under 2 years, the parent’s report is generally accurate, as expected language is fairly simple. Infants should have different cries and reactions to caregivers in the first 3 months; babble and laugh by 6 months; and imitate sounds as well as recognize a few words by 1 year. While infants typically have 1-2 words by 12 months and two-word combinations by 18 months, as a cutoff they should show 1-2 words by 18 months and either 50 words or 2 words together by 24 months. Listening to a child’s spontaneous language is the best gauge of articulation. By age 2 years, we – a stranger to the child – can only expect to understand about 25% of what they say, but by 3 years it should be 66%, and by age 4 years almost 100%.
Gestures are an important aspect of communication. Use of gestures such as raising arms to be picked up or waving bye-bye by 1 year are typical. Between 1 and 2 years, children should follow your pointing and share their interests by pointing in addition to indicating named pictures and body parts. Deficits in use of gestures should spur a language evaluation and also are part of diagnosing autism, a much more serious and specific condition defined by communication deficits. Most autism screening tools include tapping gestures as well as spoken language.
After 2 years, language assessment has to include more elements than many parents can report easily or you can observe. There is now no formal additional language screening recommendation beyond surveillance, and the general developmental and autism screens. Every state has free child development services that can assess and provide intervention for children 0-3 years if you or the parent has concerns. But you may want to do more to either reassure or clarify the need for and type of referral by using a language-specific tool. The most accurate and practical tools applicable to children 8-35 months are the MacArthur-Bates Communicative Development Inventories (CDI) and the Language Development Survey (LDS), both parent completed. The LDS assesses based on a list of vocabulary words and examples of phrases, and the CDI has three different forms using vocabulary, gestures, and sentences.
After age 3 years, language is so complex that direct testing of the child is needed. A draft report from the U.S. Preventive Services Task Force in November 2014 presents a review of all available measures.
The good news is that a variety of approaches to therapy for speech and language disorders in young children are effective in reducing impairment. The most effective ones involve the parents in learning what communication skills to observe, stimulate, and reinforce, and have an adequate number of total hours of intervention spread over several months.
As for all children and youth with special health care needs, we have the responsibility to detect, monitor, refer, track, and support families of children with speech and language disorders to assure their best outcomes. Whatever the cause, improving the communication abilities of the child can make a big difference to many aspects of their lives.
Dr. Howard is an assistant professor of pediatrics at the Johns Hopkins University School of Medicine, Baltimore, and creator of CHADIS (www.CHADIS.com). She has no other relevant disclosures. Dr. Howard’s contribution to this publication was as a paid expert to Frontline. E-mail her at pdnews@frontlinemedcom.com.