What is the standard for baby’s development at four and a half months?

Four months is a critical period for the baby's intellectual development, because the baby at four months has further improved in various aspects such as head movement, vision and hand operation. Therefore, parents should make different bedroom arrangements according to the baby's developmental status to encourage the baby to feel more fresh about the surrounding environment and to arouse a sense of exploration of the surrounding environment, so as to better promote the baby's healthy development.

1. ◎ Physiological indicators: When the baby is four months old, the weight of the baby boy is 4.7~8.5 kg and the height is 58.3~69.1 cm, and the weight of the baby girl is 4.5~7.7 cm and the height is 56.9~67.1 cm.

◎ Key points of parenting: Develop sensory motor skills, which is the combination of vision, hearing and touch with muscle activity. For example, the eyes guide the hands to pick up things, and the eyes and body move accurately when hearing sounds. Let your baby listen to music and talk to him/her more often. Do turning exercises for your baby to exercise your baby's spine and spine muscles, and help your baby learn to turn over. Encourage your baby to talk, play question-and-answer games with your baby, practice vocalization, and learn to "talk". Add appropriate amount of complementary food, such as eggs, rice noodles, vegetable puree, etc. Keep breastfeeding as much as possible. When the mother is working, she should express breast milk every three hours to promote breast milk secretion. The expressed milk can be kept in the refrigerator and fed to the baby the next day. Some babies can already roll over, so parents should be more careful about their babies' safety.

◎ Development indicators: When lying prone, the baby's upper body is completely raised and perpendicular to the bed; the legs can be raised to kick off clothes and quilts and hanging toys; the vision is flexible and can shift from one object to another; the baby begins to babble and responds to adults' teasing with voice; and the baby likes to eat complementary foods.

2. Diet for 4-month-old babies 1. After 4 months, the baby's milk intake increases again. If the mother has not yet returned to work, breastfeeding should still be the main method. A bottle-fed baby can be full with 150 ml of milk per meal. When the baby is able to eat some complementary foods, the amount of milk can be reduced, but the baby this month should still take milk as the main food. Adding complementary foods is only a "transition" to prepare for future weaning. Feeding times are 6:00 and 10:00 in the morning, 14:00 and 18:00 in the afternoon, and until 22:00 at night. Other complementary foods can be added between feedings.

2. The nutrients in breast milk or other dairy products can no longer fully meet the needs of infant growth and development, and complementary foods must be gradually added. Adding complementary foods can also help babies gradually transition to an adult diet. At the same time, training your baby to be familiar with the chewing action is also good for the baby's eating habits. The principles to be followed when adding complementary foods are: from less to more, from one type to many, from fine to coarse, and from thin to thick.

Therefore, during this critical period, parents should pay more attention to the baby's health. It is very important to give the baby proper exercise and the right food. They should also spend more time with the baby to increase the intimacy between the baby and the parents, so that they can grow up healthily with the love of their father and mother.