The standard range of height and weight of a 42-day-old baby and its measurement formula and rules

When a baby is about three months old, it is a critical time. At this time, the baby has gradually grown taller and heavier. However, some parents may not know what the normal range of height and weight for a 42-day-old baby is, and they don’t know when to take some measures for the baby. There is also a standard measurement formula for baby's weight that everyone should want to know very much. In this way, you can calculate whether your baby has enough nutrition, whether the nutrition is absorbed well, and whether the baby is growing strong enough. If you want to know the specific content, please take a look at the information brought to you by the editor.

1. Height and weight standards for infants in the first 3 months

Baby age Boy weight (kg) Boy height (cm) Girl weight (kg) Girl height (cm)

Birth 2.9-3.8 48.2-52.8 2.7-3.6 47.7-52.0

January 3.6-5.0 52.1-57.0 3.4-4.5 51.2-55.8

February 4.3-6.0 55.5-60.7 4.0-5.4 54.4-59.2

March 5.0-6.9 58.5-63.7 4.7-6.2 57.1-59.5

Basic rules for weight gain indicators: A normal full-term baby weighs about 2000-4000 grams at birth.

In the first 3 months, the baby's weight gain is 180-200 grams per week, 150-180 grams per week at 4-6 months, 90-120 grams per week at 6-9 months, and 60-90 grams per week at 9-12 months.

2. Baby weight standard measurement formula:

Weight (kg) at 1 to 6 months = birth weight (or 3 kg) + age in months × 0.6 (kg); weight (kg) at 7 to 12 months = birth weight (or 3 kg) + age in months × 0.5 (kg); weight (kg) at 2 to 10 years old = age × 2 + 7 (or 8).

3. The growth rule of baby's height standard:

The average height of a full-term baby is 50 cm. It increases by about 25 cm in the first year after birth, so it is about 75 cm at one year old. Thereafter, it increases by an average of about 5 cm each year. Therefore, the height (cm) of a child aged 2 to 12 years old = age × 5 + 75 (cm). Anyone whose height exceeds the standard by 10% or is less than 10% is considered abnormal.

The above is the normal standard range of height and weight for male and female babies who are more than 3 months old. There is also a formula for calculating the baby's weight and the standard growth pattern of the baby's height. Do you understand more about this after reading it? I hope the information provided by the editor will be helpful to everyone. Finally, I wish everyone's baby can grow up healthy.