A nurse is leading a parenting class for new parents. She explains that most babies say their first word by age

Number 2 is correct.

Rationale: At 6 months, most babies make new sounds. They might recognize their name. By 9 months, they string sounds together that do not represent words. Most babies began to speak their first word by 12 months of age, for example, “mama” and “dada.” By 18 months of age, babies should be able to say several single words.