A normal infant sits briefly leaning forward on her hands, reaches for and grasps a cube and transfer it from hand to hand. She babbles but cannot wave bye-bye nor can she grasp objects with the finger and thumb. Her age is –
**Core Concept**
Infant development milestones, specifically fine motor skills and cognitive abilities, are assessed through various motor and cognitive functions. The development of hand dominance, object permanence, and language skills is crucial in this context.
**Why the Correct Answer is Right**
The infant's actions indicate a certain level of fine motor control and cognitive development. Sitting up and reaching for objects suggest the development of truncal and upper limb strength. Transferring a cube from hand to hand demonstrates hand dominance and coordination. Babbling indicates language development. However, the inability to wave bye-bye or grasp objects with the finger and thumb suggests that she has not yet achieved the fine motor skills necessary for these actions, which are typically seen in infants around 7-9 months.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely too early for the infant's developmental stage, as the described actions are beyond the typical skills seen in 4-6 month olds.
**Option B:** This option might be correct, but it's more common for infants to develop these skills around 7-9 months.
**Option C:** This option is likely too late, as the described actions are not typically seen in infants beyond 12 months.
**Clinical Pearl / High-Yield Fact**
Infant development milestones are crucial for assessing cognitive and motor function. The Bayley Scales of Infant Development (BSID) and the Denver Developmental Screening Test (DDST) are commonly used tools for assessing these skills.
**Correct Answer: C. 12 months.**