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Conjunctions are words used to connect phrases and clauses. Between 25 and 40 months, children begin to use the conjunctions and and because (Owens, 2001) to join phrases and clauses. And is the most frequently used conjunctive form for children in the three- to five-year age range.
1 Understanding simple words â You should be concerned if your child does not understand the words no, bye-bye, and bottle (if appropriate) by the age 15 months. 2  Vocabulary â Your child should use single words by 15 to 16 months of age at the latest. 3  They should have a 10 word vocabulary by 18 months of age.