A child is typically expected at 18 months (1.5 years old) to be able to say around 20 words.
At 2 years of age he or she is verbally capable of making two-word sentences.
By the age of 3 years his speech can be understood by strangers.
It is important to observe both our child’s extra-verbal communication and his ability to understand what we say.
However, as long as the ability to express himself is delayed, even if the comprehension is good, it is advisable to consult a specialist.

*Data from ADHD HELLAS

By articulation disorder we mean the child’s difficulty in correctly producing a phoneme when the expected age of production has passed.

For example:
/l/ instead of /r/ : lodi instead of pomegranate
/g/ instead of /d/: tree instead of tree
/θ/ instead of /σ/: thupa instead of soup

Usually these variations in words sound cute, however it is extremely important to help our child smooth out this difficulty. It is very important for parents to know that a child’s speech should be completely clear before the child goes to the first grade!