Lucas was first pictured wearing a puffy romper with soft bear ears as his mother, 39, took him out for a day today.
He was strapped to his mother’s chest in a baby carrier as she tended the horses and presented him to competitors at Houghton Hall international horse shows.
The mom of three then drove the horses into the show with her son before putting him in a buggy while she chatted with other riders.
In March, the Queen’s granddaughter gave birth to Lucas, weighing 8 pounds, 4 ounces, on the bathroom floor of their home on Princess Anne’s estate in Gloucestershire.
Zara, the daughter of Princess Anne and Mark Phillips, once attended the event but today dressed casually in jeans and a baseball cap.
She was named MBE in the 2007 New Year’s Honors for her services to horseback riding and in 2012 competed in the London Olympics, winning a silver medal.
Her husband Mike Tindall, 42, revealed the news of the birth on his podcast “The Good, The Bad and The Rugby” hailing his wife as a “warrior.”
Mike said: “Fortunately Zara’s friend Dolly is… actually more important than me in making sure she attended the birth of my three children, she was there and admitted that we wouldn’t be. not got to the hospital on time, so he was run into the gym, grab a mat, enter the bathroom, towels downstairs, orthopedic brace! ”
The couple’s spokesperson also confirmed that the baby – 22nd to the throne – was named Lucas Philip Tindall, in a seemingly touching tribute to the late Duke of Edinburgh.
They also have two daughters, Mia, seven, and Lena, two.
In 2010, they announced their engagement and tied the knot on July 30, 2011 after meeting in the England campaign which won the Rugby World Cup in Australia in 2003.