A baby with tripod position, bi dexterous approach, recognizes strangers and can spell out mono syllable by what age:
**Core Concept**
Infant development milestones are crucial for assessing neurological and cognitive function. The tripod position and bi-dexterous approach are indicative of fine motor skills development, while recognizing strangers and spelling out mono-syllable words reflect cognitive and language development.
**Why the Correct Answer is Right**
By 12-18 months, infants typically exhibit tripod position, using their thumb, index, and middle fingers to grasp objects. Bi-dexterous approach, where the infant uses both hands to manipulate objects, is also a characteristic of this age group. The ability to recognize strangers and understand mono-syllable words, such as "mama" or "papa," indicates significant cognitive and language development. These milestones are associated with the maturation of the brain's language centers, particularly the left hemisphere, and the development of the corpus callosum.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not align with the typical developmental milestones of an infant. Infants typically start to develop fine motor skills and cognitive abilities around 12-18 months.
* **Option B:** This option is incorrect as it is too early for infants to exhibit tripod position and bi-dexterous approach. These skills are typically developed around 12-18 months.
* **Option D:** This option is incorrect as it is too late for infants to exhibit these developmental milestones. Most infants have already developed tripod position and bi-dexterous approach by 12-18 months.
**Clinical Pearl / High-Yield Fact**
The "tripod position" is a key developmental milestone that can help assess an infant's fine motor skills. It is essential to note that any significant delays in developmental milestones can be indicative of underlying neurological or cognitive issues.
**Correct Answer: C. 12-18 months.**