I spent little time with my younger sister during her infancy ages because she moved to the United States from Nigeria when she was almost about 5 years old. I could relate a lot of experience I had while we lived together to this chapter. This was a very interesting chapter and it answered countless questions about babies, and mostly why they act so stupid. I was a 9 years old kid who looks after his younger sister while my mother takes care of her other business, my mother used to be an authoritarian parent, while my dad was more of permissive parent. My mom made me learn how to change diapers, make baby food and some other girly things, and when I ask her why I am doing all this, she says because "I told you so and she is your sister, you need to learn how to care for her when I am not there "but sometimes my dad would help me instead. This chapter revealed to me, why I think my baby sister got more attached to me than every other person in the house and why she always comes to me when she need anything. My baby sister coming to me whenever she wanted something was a bit problem, because my mom would say you are spoiling my baby, which I thought I was never spoiling my sister by giving her all she wanted and asked for. To me I was just been a sweet brother, who loves his baby sister and gained her trust. Although sometimes she acts like a brainless human being, this was so annoying and frustrating. When she was about 12 months, her brain developed physically; she could crawl, sit by herself and walk. This was good because 25 percent of babies walked by 11 months, 50 percent within a week after their first birthday, and 90 percent by age 15 months (Frankenburg et al., 1992). But still she was a lazy baby, she could walk but still decide on to crawl, sometimes she would cry for me to carry her instead of walking or crawling like she does to where ever she wanted, she manipulates me. When she was almost about 3 years old, some part cog