#AskTheExpert my son is 2years 11 months old does not speak and does not understand instructions. by he sings rhymes , ABC and numbers. plays alone.

A. Parents and regular caregivers should understand about 50% of a child's speech at 2 years and 75% of it at 3 years. By 4 years old, a child should be mostly understood, even by people who don't know the child.