Kate Middleton, 36, is pregnant with her third child with Prince William, 35.
Already a mother to Prince George, 4, and Princess Charlotte, 2, the Duchess is well used to pregnancy and birth.
As one of the most photographed women in the world, Kate will probably be keen to get back in shape after her baby is born - particularly with Prince Harry and Meghan Markle's wedding in the diary just weeks after the birth.
But working out after having a baby, especially if breastfeeding, is different than at other times in a woman's life.
Celebrity personal trainer Paulette Sybliss has the nutrition and fitness tips Kate should follow to get back to her best this April.
Rest
"Kate needs to first rest and recover from her pregnancy. Even as an experienced mum every pregnancy takes its toll on the body.
"Kate's new addition to her family will need a rested, and healthy mum for the future weeks and months. Sleep will be just as important for Kate as her new baby."
Fitness
Depending on the type of birth, Kate will need to wait at least six weeks post-pregnancy before even considering starting any type of fitness regime. This time frame will be longer if a caesarean birth is had.
Once Kate has been given the go-ahead to start any type of fitness regime, she should ensure she takes things easy, going back to basics and gradually building up the strength in her body. She must make sure she is doing her pelvic floor exercises regularly.
Working with light weights or body weight exercises to begin with, will help Kate to tone her body and to lose any pregnancy body fat she may have gained.
Resistance training will also help Kate to get her body back to its pre-pregnancy strength. If Kate wishes to do any cardio at such an early stage post pregnancy, she should focus on gentle cardio such as walking.
Nutrition
"Initially, Kate should refrain from dieting. Her body will be recovering from major hormonal changes post-pregnancy and that is not a time to be depriving her body of essentials nutrients that can often be cut out when dieting.
"Eating healthy and balanced foods will help Kate to regain her pre- baby body and if she breast feeds at any stage this can also assist with her burning more calories throughout the day."
Kate is not the only member of the Royal Family who will be preparing for Harry and Meghan's wedding - and Paulette has shared a workout plan for bride-to-be Meghan Markle to follow too.