Personally, I think it is necessary. For example, my baby's father and I are both busy at work. Even after returning home, we seldom have time to spend with our children, let alone answer those strange questions. Then we listened to Amway, our best friend, and bought alpha eggs for our children. We have encyclopedic answers, which can answer children's 100,000 whys, or spend time with children and chat with them. Our children won't feel so lonely with his company.