Weight gain during pregnancy

Weight gain during pregnancy: Standards, myths, and reality

Weight gain is a completely normal, healthy, and necessary part of pregnancy. Every kilogram gained plays an important role in supporting the growth and development of your baby, as well as preparing your body for labor and breastfeeding. Society often broadcasts unrealistic expectations, causing women to worry about every number on the scale. It is important to focus not on general myths but on individualized recommendations based on evidence-based medicine, and to understand what exactly makes up this weight.

Where do the kilograms "go"? Weight distribution

The weight you gain is not just fat deposits. At the end of pregnancy, the average weight gain (about 12-16 kg) is distributed roughly as follows:

• Baby: ~3.5 kg
• Placenta: ~0.7 kg
• Amniotic fluid: ~0.8 kg
• Uterus enlargement: ~0.9 kg
• Breast enlargement: ~0.4 - 0.9 kg
• Blood volume increase: ~1.2 - 1.5 kg
• Fluid retention in tissues: ~1.2 - 2.0 kg
• Maternal fat stores: ~3.0 - 4.0 kg (necessary energy reserve for labor and lactation)

Why are recommendations individualized? The role of BMI

There is no single "ideal" weight gain figure for everyone. Recommendations depend on your body mass index (BMI) before pregnancy. BMI is calculated as weight in kilograms divided by the square of height in meters. The lower your initial BMI, the more weight is recommended for you to gain, and vice versa. This is necessary to ensure adequate fetal growth and minimize risks. You can calculate your individual target using our weight gain calculator.

Weight gain dynamics by trimester

Weight gain is non-linear. In the first trimester, due to morning sickness, the increase may be minimal (1-2 kg) or even a slight weight loss may occur, which is normal. The main weight gain occurs in the second and third trimesters, averaging 300-500 grams per week. More details can be read in the article "Weight gain".