What other measures did she go to achieve such impressive weight loss?
Dr Charlotte Norton, the Medical Director at The Slimming Clinic claims the Princess used a natural method to initially lose weight.
She told Express.co.uk: “I’m sure there would have been a lot of factors which contributed to Princess Beatrice’s impressive post-baby weight loss.
“One of the things that aids with weight loss significantly is breastfeeding.
“While the amount of weight that can be lost via breastfeeding varies person to person, typically an individual could look at burning between 500 and 700 calories per day.”
Breastfeeding burns up to 500 calories a day.
On average if a woman is taking the recommended amount of calories each day and breastfeeding exclusively then she can lose one pound every week or two.
What diet did Beatrice follow to get her body back?
Dr Charlotte added: “In order to achieve sustainable weight loss, it is likely that the Princess would have had a high-fibre diet consisting of foods such as avocados, berries, beans, broccoli and more.
“Coupling a healthy and nutritious diet with exercise would have also contributed to her weight loss.
“However this would of course depend on the healthcare advice provided post-pregnancy.
“Lastly, sufficient water intake aids in the removal of toxins from the body and boosts metabolism.
“This can of course aid in post-pregnancy weight loss.
“That being said, exercise post-pregnancy would largely depend on the type of pregnancy that Princess Beatrice experienced.
“While it is normal to begin exercising soon after giving birth, depending on the trauma to the body, it may differ from person to person.
“I imagine that providing Princess Beatrice’s birth was healthy, then she would have certainly implemented some cardio and resistance training to aid her in losing weight.”