A nurse is caring for an infant in the provider's office. Drag words from the choices below to fill in each blank in the following sentence. The nurse identifies the assessment findings of dropdown and dropdown should be reported to the provider.

Developmental milestones are used to evaluate neurological, motor, and social progression during infancy. At 9 months of age, infants are expected to sit independently, begin pulling to stand, and demonstrate early language development such as babbling. Failure to achieve age-appropriate gross motor and language milestones may indicate developmental delay, neurological impairment, or underlying systemic conditions requiring further evaluation. Rationale for correct choices: • Sitting ability: By 9 months, infants are expected to sit independently without trunk support and begin transitioning toward crawling and pulling to stand. This infant is only able to sit with trunk support, which indicates delayed gross motor development. This suggests possible neuromuscular delay, hypotonia, or other developmental concerns affecting core muscle strength and postural control. Delayed sitting ability should be reported for further evaluation. • Vocalization: By 6 to 9 months of age, infants should be babbling with consonant sounds such as “ba,” “da,” or “ma,” which reflects normal language and social development. The absence of vocalization or babbling at 9 months is a significant developmental delay in speech and language milestones. This may indicate hearing impairment, neurological delay, or global developmental delay. Lack of early communication skills requires further assessment. Rationale for incorrect choices: • Tooth eruption: The appearance of a single lower central incisor at 6 months falls within normal variation and does not require concern. Tooth eruption timing differs significantly between infants and is not used as a primary developmental milestone marker. Therefore, this finding is considered normal and does not need to be reported. • Fine motor skills: No evidence in the assessment suggests abnormal fine motor development, such as inability to grasp objects or poor hand coordination. Without abnormal findings, fine motor skills cannot be identified as delayed.