I recently cared for a 13 month old girl. I started when she was 8 weeks old. I was with her 9 hours a day, and was in charge of her meals, driving her to activities, and all basic care. Before her, I cared for a little boy. I started when he was newborn. I was in the house at all times, along with a stay at home mom. I helped put him down for naps, feed him, do basic cleaning, and laundry. Changing his diapers. Took him for walks.
Prior to him, I cared for a little girl since she was 8 months old until she was 27 months. I took her on play dates, to the park, cooked her food, cleaned the house, put her to bed. I found her family medical insurance, did all the laundry, and was in charge of basic household duties. The job was full time.
Before her I took care of a 3 year old part time. I also arranged play dates, cooked her food, and did the child's laundry.
Prior to that I cared for a six year old girl full time. Again, the job required arranging play dates, taking to and from school, helping with basic homework, cooking simple meals. This job ended as the family no longer needed a nanny, but I still babysit for them frequently.