Question 1
In the United States, about what percent of 1-year-old infants are able to stand by themselves and take their first step?
◦ about 20%
◦ about 50%
◦ about 75%
◦ nearly 100%
Question 2
In the United States, at about what age is the average child first able to sit without support, if placed in this position?
◦ age 4 months
◦ age 8 months
◦ age 10 months
◦ age 12 months