Zara Tindall Competes At The Whatley Manor Horse Trials at Gatcombe Park on September 7, 2018 in Stroud, England.

Zara Tindall competes, on her horse 'High Kingdom', in the cross country phase of the Whatley Manor Horse Trials at Gatcombe Park on September 7, 2018, in Stroud, England.

Zara Tindall pushes baby daughter Lena Tindall in her buggy as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Zara Tindall competes, on her horse 'High Kingdom', in the cross country phase of the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Zara Tindall competes, on her horse 'High Kingdom', in the cross country phase of the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Zara Tindall warms up, on her horse 'High Kingdom', before competing in the dressage phase of the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Mia Tindall attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Mia Tindall was dressed in a white dress and grey hooded jumper, with a pair of grey ankle boots proving a practical choice for her day of activities. Also added a blue padded gilet with fluorescent pink piping was layered on top of her dress as the autumn chill set in.

Mia Tindall feeds grass to her mother Zara Tindall's horse 'High Kingdom' after she competed in the dressage phase of the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

After all the fun it was time for a break and Mia Tindall plopped herself on the grass where she was seen absent-mindedly chewing on the arm of her trendy sunglasses.

Mia Tindall attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Mia Tindall put on her trendy sunglasses as she plopped herself on the grass during the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Mia Tindall was dressed in a white dress and grey hooded jumper with a blue padded gilet with fluorescent pink piping was layered on top and sported a trendy sunglasses, as she attends the Whatley Manor Horse Trials 2018vat Gatcombe Park in Stroud, England.

Mia Tindall has seen feeding grass to her mother Zara Tindall's horse 'High Kingdom' after she competed in the dressage phase of the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Mia Tindall in a white dress with a pair of grey ankle boots as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Mia Tindall sits in her grandmother Princess Anne's Land Rover Discovery as she watches her mother Zara Tindall compete in the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Mia Tindall was dressed in a white dress with a pair of grey ankle boots a good choice for her day of activities during the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Zara Tindall talks with her mother Princess Anne, Princess Royal and daughter Mia Tindall after competing (on her horse 'High Kingdom') in the dressage phase of the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Mia Tindall walks her grandmother Princess Anne's bull terrier royal dog as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Princess Anne, Princess Royal walks her bull terrier royal dog as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Princess Anne, Princess Royal, accompanied by Mia Tindall, walks her bull terrier royal dog as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Princess Anne, Princess Royal walks her bull terrier royal dog as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Dolly Maude (carrying a young baby in a papoose) and Princess Anne, Princess Royal attend the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Princess Anne's royal bull terrier dog seen in Princess Anne's Land Rover Discovery at the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Dolly Maude carrying baby Lena Tindall in a papoose and Princess Anne, Princess Royal as they attend the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Dolly Maude carrying baby Lena Tindall in a papoose, Princess Anne, Princess Royal, and Mia Tindall as they attend the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Zara Tindall pushes baby daughter Lena Tindall in her buggy as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Zara Tindall pushes baby daughter Lena Tindall in her buggy as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Zara Tindall pushes baby daughter Lena Tindall in her buggy as she attends the Whatley Manor Horse Trials 2018 at Gatcombe Park in Stroud, England.

Zara Tindall's three-month-old baby Lena Elizabeth was seen in public for the first time today. The infant, who was born on June 18, was carried around the site by family friend Dolly Maude, pictured. Close at hand was her doting grandmother Princess Anne, 68

Mia Tindall was seen playfully draping a towel across her head, made her minder chuckle as she draped a towel across her head.

Zara Tindall prepares to take part in an event at the Gloucestershire horse trials

Mia Tindall beamed as she picked up a horse crop and charged across the field, as if pretending it was a javelin, pictured, at the horse trials on September 7, 2018

Mia Tindall checked out the competition at the Whately Manor horse trials 2018, who was dressed in a white dress and grey hooded jumper, with a pair of grey ankle boots

Mia Tindall did not appear to want her hair straightened out after playing, pictured.

Mia Tindall, four, joined her mother at the Whately Manor International Horse Trials 2018 in Gloucestershire. She was seen enjoying herself as her mother competed

Four-year-old Mia Tindall looked relaxed as she took time out from playing in the grounds of the horse trials at Gatcombe Park, Gloucestershire

Horse trainer Dolly Maude took care of sleeping Lena Tindall (pictured in the carrier, left) as her mother took part in an event. Above, Dolly with Zara's mother Princess Anne.

Mia Tindall, four, strolled behind grandmother Princess Anne while family friend Dolly Maude carried three-month-old Lena Tindall in a front baby carrier

Princess Anne, right, and Dolly Maude with Zara's three-month-old baby Lena Tindall

Princess Anne keeps a tight hold on the lead as granddaughter Mia Tindall leads her royal pit bull terrier out into the grounds of the horse trials 2018 at Gatcombe Park, Gloucestershire

Mia Tindal looked relaxed as she leaned on the open window next to grandmother Princess Anne

Princess Anne keeps a close watch as granddaughter Mia Tindall leads her royal bulldog terrier out for a walk at the horse trials at Gatcombe Park, Princess Anne's home

Mia Tindall grins as she hops into the front seat of grandmother Princess Anne's car at the horse trials. It is the first time she has been seen in public with little sister Lena Tindall

Mia Tindall looked confident as she clutched onto the lead and led her grandmother's royal dog out for a walk

Zara Tindall's three-month-old baby Lena Elizabeth Tindall was seen in public for the first time today. The infant, who was born on June 18, was carried around the site by family friend Dolly Maude, pictured. Close at hand was her doting grandmother Princess Anne.

Zara Tindall looked focus as she trotted off for the start of the event

Mia Tindall was later seen hopping into the car with her grandmother Princess Anne, while a curious royal pit bull terrier stuck its head out of the back window