Language Milestones: Expected Number of Words by Age

Language milestones are helpful to identify language delays. Identifying the number of words a child says is one of many language milestones to keep an eye on. Developmental milestones are based on 90% of children within a specific age group having the skill. That means only 10% of children do not have the skill. Therefore, milestones represent the vast majority and missing a milestone may be a cause for concern.

Milestones do not reflect the average performance of children. The average performance (about 50% of children with a skill) helps parents and therapists better understand developmental norms. Norms are important when considering the development of a child.

For example: A 15-month-old child meets the language milestone of saying 2 words. A parent may be excited because their child met their language milestone. In only 3 months, the same child is expected to say at least 20 words. That is 18 additional words. If the parent was aware of the 50% average or 10 words at 15 months, they may be less excited but could focus more on their child’s language development.

Learn about language milestones and averages by age below.

Child's Age	Milestone (90% of children)	Average (50% of children)
12 months	1 word	2-6 words
15 months	2 words	~ 10 words
18 months	20 words	50 words
24 months	50 words	250 words
36 months	250 words	1000 words

Is your child not meeting their milestones? Email thespotwithmskellie@gmail.com to schedule a free consultation.