Children vary in their acquisition of language skills. Some children speak only single words until age two, and others string several words together at 20 months. Some talk almost constantly while others seem to use language very sparingly. Some children use language to control their environment while others use it only in response to their environment. Parents, you should not become alarmed when your child does not meet every criterion for his or her developmental age. Rather, you should use this criteria as a measure to enable you to monitor your child's developmental language skills. This will help you to determine if evaluation or intervention may be helpful.