What are the standard weight gain criteria for infants

Patient's question:

I just had a baby, but it seems like my little one is malnourished. They weighed six and a half pounds at birth, but now at three months old, they only weigh ten pounds. I see other children's weights are already around twelve or thirteen pounds. I've been breastfeeding them consistently every day and want to understand the standard growth rate for babies.
What kind of help do I need: What is the standard weight gain for infants?

Doctor's answer:

The weight calculation formula for infants aged 1 to 6 months is the birth weight plus the age in months multiplied by 0.7. If the birth weight is 3 kilograms, according to this formula, a 4-month-old infant's typical weight should be around 5.8 kilograms.
Infants' height is typically 50 centimeters at birth and 75 centimeters at one year old. For a 4-month-old infant, there is no fixed value, but the smaller the child, the faster the height growth.
Food and Nutrition. Nutrition consists of seven essential elements: protein, fat, carbohydrates, vitamins, water, fiber, and minerals. None of these can be missing. It is recommended that mothers eat more lean meat such as pork, chicken, and fish. It is best to drink a glass of pregnancy milk powder in the morning and evening to enhance the nutritional content of breast milk. Avoid eating greasy and difficult-to-digest foods such as lard, pig trotters, potatoes, taro, and soybeans.

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