Kate Middleton's sister looked incredible as she took a dip in the sea off the coast of St Barts in a white bikini a mere eleven weeks after going into labour.
That she is already back to her pre-pregnancy shape is perhaps unsurprising, given Pippa's genes and healthy lifestyle – which she continued right up until she welcomed baby son Arthur with husband James Matthews.
The 35-year-old new mum is, after all, related to the Duchess of Cambridge, who departed the Lindo Wing three times looking remarkably trim.
Then there's Pippa dedicated fitness regime which she continued right through all three trimesters.
Pippa revealed in her Waitrose magazine column that she dropped her usual four to five workouts a week down to three or four 45-minute sessions during pregnancy.
These included either ballet-inspired barre, strength and conditioning exercises, Pilates or yoga, and on 'rest' days she'd cycle or walk with weights.
As her pregnancy progressed, she incorporated tennis and swimming, too.
Added to this is her healthy diet of "whole-grain, energy-fuelled carbohydrates and three meals a day" that always includes a breakfast of "plain yoghurt with chopped fruit and toasted seeds, oats and nuts or toasted rye bread with eggs or avocado".
The ripped socialite joins a cohort of fellow new celebrity mums – including her brother-in-law Spencer Matthews' wife Vogue Williams who she is currently on holiday with – who also appear to have bounced back into shape faster than you can say "maternity leave".
These include Abbey Clancy – who announced this week she is pregnant with her fourth child.
The 32-year-old model and wife of footballer Peter Crouch sported a flat stomach within months of giving birth to all three of her kids, now aged between one and seven years old.
Abbey previously told Women's Health magazine that her speedy return to her pre-pregnancy shape is down to genetics.
She said: "My mum had four children and each time she had a baby, she was back to normal within weeks. So genetics play a strong part. I don’t diet, but…neither do I sit still."
Corrie star Helen Flanagan also looked liked she's just stepped off a calendar shoot in September while on the beach in Ibiza.
Looking incredible in a red string bikini, it was just 12 weeks since the 28-year-old had given birth to her second daughter Delilah.
After having her second child Helen, who's engaged to Scott Sinclair, told OK! magazine that her second labour was a lot more painful than her first.
The star – who had a water birth – confessed: "At points I felt like I was about to explode because the contractions were so intense.
"Delilah's birth was so quick – Scott almost missed it."
But these women aren't alone.
Similarly, Ferne McCann, 28, had also returned to impressive shape less than half a year after giving birth to her daughter Sunday in November 2017.
Speaking to the Belfast Telegraph, she said: “For me, it's all about making healthy choices, not starving yourself or denying yourself every day.
“I try to make healthy choices but it's not like I cut out carbs or alcohol or Chinese takeaways completely because they are things that I absolutely love."
The reality TV star also in the past revealed she does boxing and cardio-based weight training with a personal trainer.
Tamara Ecclestone also shocked when she put on a bikini for a holiday in Morocco just seven weeks after giving birth to her daughter Sophia, now four years old.
She became her thinnest following the birth in 2014, telling The Sun's Fabulous magazine in 2017 that it was down to breastfeeding.
The star, now 34, said: "I was breastfeeding round the clock and the weight loss just strangely happened. But your body tends to find its way back again.
"I wasn’t worried because it happened to my mum [former model Slavica]. But I don’t like being really skinny. It didn’t feel like my natural body weight, so I’m pleased it sorted itself out.”
However, while these women have attributed their post-baby bodies to a mixture of fitness, genetics, healthy eating and even breastfeeding, what is the real reason?
The answer is more often than not is fitness and nutrition, according to Clare Bourne, specialist women's and men's health physiotherapist at Six Physio Chelsea – who says age, how many children you have had and whether you had a vaginal birth or a caesarean section shouldn't really make a difference.
"If you're really strong and in great shape before you're pregnant, and you exercise the safe way and the right way during pregnancy, your post-natal recovery will generally be quicker," she says.
"If you do nothing for nine months, for example, your muscles will get weaker."
Clare reveals that Pilates is one of the most effective types of exercise you can do pre- and post-pregnancy.
"It helps you hone a really deep, strong core – as well as six pack muscles called the rectus abdominis – so your tummy has a better chance of 'snapping' back after birth," she explains, while noting this isn't foolproof.
"The tiredness that comes with being a new mum can also make it hard to eat well, and often lead to over-consumption of sugar for quick-fix energy.
"Celebrities often have a lot of help with meals and workouts after giving birth," she points out.
"Most new mums are exhausted and don't have the extra support."
She adds that, even then, celebrities aren't immune to what is a tough experience for the body, pointing out that Vogue, who looked incredible after the birth of her baby son Theodore with Spencer Matthews, recently revealed on Instagram that she got her pelvic floor checked because she didn't feel confident running.
NHS guidelines for exercise after having a bay…
Your postnatal check at around six to eight weeks after the birth is a good time to talk to your GP about any physical or mental health problems you've had since the birth.
If you had a straightforward birth, you can start gentle exercise as soon as you feel up to it. This could include walking, gentle stretches, pelvic floor exercises and deep stomach exercises.
It's usually a good idea to wait until after your six-week postnatal check before you start any high-impact exercise, such as aerobics or running.
If you exercised regularly before giving birth and you feel fit and well, you may be able to start earlier. Talk to your midwife, health visitor or GP.
If you had a caesarean, your recovery time will be longer, so talk to your midwife, health visitor or GP before starting anything too strenuous.
Dr Amal Hassan, who specialises in sport and exercise medicine, agrees that while a new mum may look like her body has returned back to its pre-pregnancy state, she may not be functioning that well physically.
"A lot can be masked in a photograph," she says, also pointing out that there hasn't been any research done into why some women seem to return to their pre-pregnancy physique quicker than others.
"Everyone is very different physiologically, and while it's tempting to compare yourself to other new mothers, each of us lead different lives."
She explains that this can translate into a very different pregnancy and labour, which can influence how quickly you personally return to fitness.
"How difficult or traumatic a birth is can really affect how soon you are able to exercise," she explains.
"This can impact on your energy in the weeks following labour."
Lack of time and motivation levels can also play a factor.
Breastfeeding as a means of aiding weight loss is possibly a myth, she says.
"Some women report that they don't lose weight until they finish breast-feeding, while others can't eat enough whilst they are," she explains.
"It's broadly based on your metabolism."
Dr Hassan recommends new mums heed the NHS guidelines which suggest waiting until your six to eight week GP check before doing anything too strenuous.
"However, new mums should be aware that's not a sign-off to dive back in," she warns.
"Make sure you have a class instructor or personal trainer adequately qualified and experienced in looking after post-natal women who can assess you too, and also monitor whether you are suffering symptoms of pelvic floor dysfunction or a widened tummy gap, or whether you over-reaching – particularly during intense workouts like HIIT."
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