example:

The energy requirement for a 25-year old woman who weighs 50 kg, is 165 cm tall, and is moderately active is estimated to be 2000 kcal. Her energy needs during lactation are estimated to be:

• 1st 6 months: 2000 + 330 = 2330
• 2nd 6 months: 2000 + 400 = 2400

If she is not breastfeeding, her estimated energy needs remain around 200 kcal.