Parenting knowledge 1. Newborn: refers to babies under the full moon or children born to 28 days, mainly introducing the knowledge of feeding, nursing and health care of newborns. 2.0- 1 year-old is also called infant stage: it mainly introduces the baby's early education, intelligent training, physical development and other knowledge. 3. 1-3 years old is also called infant parenting knowledge: it mainly introduces the baby's knowledge of nutrition, health care and disease prevention, and it is also called preschool children: it mainly introduces the baby's knowledge of intelligent training and psychological development.