Male baby: height 57.9-71.7cm; Weight 5.25-10.39 kg; The head circumference is 38.0-45.9cm.

Baby girl: height 56.7-70.0cm；; ; Weight 4.93-9.66kg；; ; The head circumference is 37.2-44.6cm.

Note: It is compiled according to the Reference Standard for Growth and Development of Children under 7 in China, Ministry of Health.

Capacity development:

The development of baby's ability mainly refers to the all-round development of big sports, fine movements, vision, hearing, touch, smell, taste, language, emotion and social communication. However, each baby's focus is slightly different every month, which is also related to the baby's own development characteristics.

The basic abilities of a 4-month-old baby include:

Ability to master (most babies can do it): smile and laugh; You can support your body weight with your legs; You can make a "goo goo" response when talking to him.

Developing ability (half of babies can do it): being able to catch a toy; You can turn from prone to supine.

Advanced ability (only a few babies can do it): can imitate dad's "big" voice; Grow the first tooth; Maybe it's time to start adding complementary food.

Diet:

Add rice paste, fruit juice and vegetable soup as appropriate. When children get used to rice paste, fruit juice and vegetable soup, they will start to add protein food. At first, they could only add 1/4 yolk mud and never feed protein.

Rice paste: rice soup is not easy to cause baby allergies.

Protein food: Egg yolk can be made into paste, or chicken liver can be added to increase iron.

Fruit juice: vegetable juice, orange juice, apple juice and tomato juice.