Don't blink—because Kourtney Kardashian and Travis Barker's baby boy is growing up fast. 

In fact, their son Rocky Barker already has a full head of brown hair in family photos shared by Kourtney Sept. 13.

One image posted on the Keeping Up With the Kardashians alum's Instagram showed the 10-month-old sitting up on his own at a window ledge overlooking a city skyline. Meanwhile, he was pictured being held up by his rocker dad in another snapshot.

In a separate mirror selfie, taken amid Travis' ongoing tour with Blink-182, Kourtney breastfed Rocky as they snuggled under the blankets on a hotel bed.

She captioned the snapshots, "summmma adventures : part 2."

The cute update came a week after Kourtney shared a behind-the-scenes look at life on the road with Travis and his band. In a Sept. 5 Instagram post, the 45-year-old—who is also mom to kids Mason 14,  Penelope, 12, and Reign, 9, with ex Scott Disick—can be seen packing PDA with her husband backstage during his New York show.

Other photos taken on the same night showed Kourtney holding Rocky on her lap as she played chess with Reign.

And Travis loves having Kourtney and the kids on tour. On a July episode of The Kardashians, he had a blast taking the family out to Sydney's Luna Park before his concert in the Australian city.

While playing carnival games with Kourtney's kids, the musician won a Squishmallow plushie for Penelope, before Reign surprised him with a prize of his own.

"Aw," Travis—who shares kids Alabama Barker, 18, and Landon Barker, 20, as well as stepdaughter Atiana De La Hoya with ex Shanna Moakler—said after the young boy handed him a stuffed toy. "Thanks, Reigny."

And what does Kourtney think of her blended family? 

"The more kids, the merrier," she shared in a 2022 Kardashians episode. "It's more people to love. I am really close with Travis' kids and I love them, and it's a beautiful thing." 

The Poosh founder, who had been friends with Travis for years before going public with their romance in 2021, added at the time, "I think because we've all known each other, it does make it easier to blend our families. It's all I could ever want."

To see more of Rocky—as well as Kourtney and Travis' blended family moments—keep reading.

Kourtney Kardashian and Travis Barker's son Rocky Thirteen Barker in this photo shared on Instagram September 2024.

The reality star bundled up in a cheetah print coat as she carried Rocky in this snapshot shared by Travis in September 2024.

The Blink-182 drummer kissed his baby boy on the cheek in this September 2024 picture.

Say cheese! Kourtney snapped a breastfeeding selfie with Rocky in September 2024.

"Happy Father’s Day @travisbarker !!" Kourtney wrote to Travis on Instagram on Father's Day 2024, sharing never-before-seen pics of her husband with their son. "Beyond grateful for the Dad that you are to our baby boy, and all of our kids."

Kourtney continued, " You keep us safe and protected and take care of us. Having a family with you is heaven. Happy to celebrate you!"

Kourtney also included this pic of Travis and Rocky in her Father's Day tribute.

Travis played with his baby boy on a private plane.

The Poosh founder and the rocker shared a sweet kiss while holding their son Rocky, who they welcomed on Nov. 1, 2023.

Travis commemorated Kourtney's first Mother's Day with Rocky, writing on Instagram in May 2024, "Happy Mother’s Day to my best friend and partner."

"Our children are so lucky to have you," the musician—who is also dad to step-daughter Atiana de la Hoya, son Landon Barker and daughter Alabama Barker with ex Shanna Moakler—continued in his tribute to Kourtney. "Thank you for filling our home with love, laughter, and joy."

Sharing photos of Kourtney and Rocky, Travis added in his Mother's Day message, "I love you forever and ever my wife @kourtneykardash."

Rocky fell asleep during this tender moment with Kourtney, who also shares kids Mason, Penelope and Reign with ex Scott Disick.

Travis shared a sweet look at life with their baby boy, captioning this mother-son photo on Instagram in April 2024, "I love our life together. Thank you for being the most amazing wife a person could ask for."

The Kardashians star celebrated her 45th birthday alongside Travis and Rocky in April 2024, with the family ringing in the milestone with a firework display.

Rocky took his first international flight when the family flew down to Australia for Travis' Blink-182 tour in March 2024.

Travis splashed around the gentle waves with his son during a family vacation in the Bahamas.

Kourtney and Rocky shared a bed in this sweet snap posted by Travis on Mother's Day 2024.

The drummer's baby boy joined him behind the kit.

Kourtney and baby Rocky kicked back by the pool during a tropical vacation in April 2024.

Travis shared this adorable photo of Rocky and his mama on Kourtney's 45th birthday in April 2024.

The Blink-182 rocker held his son during Kourtney's 45th birthday celebrations.

Rocky donned on a pair of elf boots during Christmas 2023.