Final answer:
Infants typically develop the pincer grasp around ten months, pull themselves to stand by twelve months, and engage in crawling, playing peek-a-boo, and developing stranger anxiety around six months.
Step-by-step explanation:
The pincer grasp:
Infants typically develop the pincer grasp, which involves using the tips of the thumb and forefinger to pick up objects, around ten months of age.
Pull themselves to stand:
By the end of the first year, around twelve months of age, infants can stand while holding onto furniture or someone's hand.
Crawl, play peek-a-boo, and develop stranger anxiety:
Around six months of age, infants can usually crawl, play peek-a-boo, and start showing anxiety toward strangers.
Overall, infants exhibit these milestones at different ages, but they generally develop the pincer grasp around ten months, pull themselves to stand by twelve months, and engage in crawling, playing peek-a-boo, and developing stranger anxiety around six months.