The NHS estimates that the average woman will gain 10 – 12.5 kg whilst pregnant. The average newborn weighs between 2.5 and 4.5 kg. So, why the discrepancy? What is causing the extra increase in weight, over and above the mass of the developing baby?

The following factors will all contribute to the extra KGs gained during pregnancy:

• Placenta
• Amniotic fluid
• Extra water
• Breast growth
• Increased blood supply
• Larger uterus.

The body will also be storing fat in preparation for breastfeeding

Read more about healthy weight gain during pregnancy.