My sister got married two years ago and now her daughter is one year old. Last week, my sister was busy and she asked me to take care of her child for half a day. I said yes without hesitation, because I thought it would be very easy, but later it turned out to be wrong. My niece was moving all the time. As she was too young to walk, so she crawled everywhere, then I needed to focus my attention all the time. Once she was out of my sight, then something bad would happen. Though I sat at the t...