1. baby 2 to 3 months old, should stop giving him a pacifier. If your baby is still holding a pacifier after 3 months, it may have an impact on learning to speak. When your baby is 3 months old, start letting him sleep alone in his crib. If you do this later, it will be harder for him to adapt to sleeping alone in a crib. 3. After your baby learns to walk 3 to 6 months, you can put him on a swing that older children play on. Once a child learns to walk, he has a good “reactive balance” ability, which means he can adjust the muscles of the arms to maintain balance. However, it is important to note that you must ensure that the swing is low to the ground and gently push the swing to avoid accidents. 4. Before the baby is 5 months old, you do not have to take him with you if you go out on a trip. At this age, the baby, you are not with him, he will not miss you. In many cases, a 5-month-old is more likely to be happy if you are away than a one- or two-year-old. The sooner you start leaving your child and telling him you will be back to get him used to being watched by another person, the easier it will be for him to sleep in separate rooms from you later. 5. Take your baby to the dentist when he gets his first tooth in 6 months, and no later than his first birthday. 6. When your baby is 6 months old, start teaching him vocabulary, numbers, colors and shapes; it won’t take long for his comprehension to develop. Keep your baby entertained by learning with books, things that have life in them, and tell him that bananas are yellow and balls are round. Instead of using teaching cards, sing him songs, tell him stories and read him nursery rhymes. 7. When your baby can sit up and can see his partner clearly, let him play with another baby regularly. Babies are much more interested in their peers than people think. By the time babies are 2 to 3 months old, they can notice each other. by 9 to 12 months old, they will be giving each other toys and imitating each other. To encourage good friendships between your baby and other babies and to avoid them fighting with each other as much as possible, you should have some extra toys on hand. 8. When your baby grows to 5 to 18 months, you can let him play with the slide. When babies learn to walk, they have the ability to control their vascular nerves and adapt their body posture. This allows him to safely slide down the slide. 9. When your baby is able to sit smoothly, you can give him a ride on toy. Some children can coordinate their feet well and push the toy forward and backward; some children can play happily with your push. 10. When the baby is 18 months old, you can buy him a three-wheeled bicycle. Although he can not yet coordinate the movement of the pedal, but he can happily sit on the pedal car and hold the handlebar. 11. At 18 months old, you can start to let your baby do housework. At first, you can let him organize toys or bring paper towels to the table. As he gets a little older, give him more things to do, such as watering the flowers, making the bed, etc. 12. When your baby is 18 months old, instead of letting him use a sip cup, try letting him drink from a cup at the table. Prepare an absorbent cloth. 13. don’t give him a pet to play with until the baby is 2. A 2-year-old toddler will watch a fish with interest, and there is no danger. For pets like cats and dogs, it’s best to wait until he knows how to be polite (at least 3 to 4 years old) before letting him touch them. 14. When the baby is about 2 years old, give him a larger toddler bed. The original crib seems small, and most babies are able to put one leg over the bed rails, which is dangerous. 15. When your baby is 3 years old, teach him to blow his nose. Children at this age like to imitate the behavior of adults to please them. So if you teach him by hand, he can master it very well. 16. When the baby is 3 years old, start to let him attend baby parties regularly. Of course, the baby’s maturity, temperament and closeness to other children are important. If your child cannot play comfortably when you are not present, then it is recommended that the next play activity take place at your home. 17. When your baby is 4 years old, teach him to tie his shoes. Although the child will not master some manipulative skills until after the age of 5, he should start to develop his cognitive and manipulative skills before the age of 5. 18. When the baby is 4 years old, he can be allowed to participate in swimming training. Children should not learn to swim until they are 4 years old because they do not yet have good coordination to swim alone. You should treat swimming lessons for pre-4 year olds as an aquatic recreation program and an activity to acclimate your child to the water. When your baby is 4 years old, let him learn to answer the phone. 4 year olds can speak and be understood by strangers 100% of the time. At age 4, teach your child to ride a two-wheeled bicycle. Most 4 year olds have enough balance to ride a bike alone.