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Delivery immediately removes the baby, placenta and amniotic fluid - roughly the birth weight plus 2 kg - and further fluid clears over the following weeks. Gaining 14 kg with a 3.4 kg baby leaves about 8.4 kg retained at delivery, typically declining around 0.4 kg a week thereafter. Retention of a few kilograms at six months is common and normal.
Immediate loss
baby weight + about 0.7 kg placenta + about 1.5 kg fluid
Retention
retained = total gain - immediate loss, declining gradually
This is a general estimate only and not medical advice. Postpartum weight change varies widely and is affected by breastfeeding, sleep, recovery and any complications. Discuss postpartum weight and nutrition with your midwife, health visitor or doctor rather than working to a calculated target.
Six to twelve months is typical, and many women retain 1-3 kg longer term. Individual variation is very wide.
It adds roughly 300-500 kcal a day of energy demand, which helps modestly, though appetite often compensates.