I went last year and I was sure I saw strollers. Not for sure, but I looked on the site " https://cotaexperiences.com/faqs " and found this. Not real sure though, Covid had changed the world. Cough Cough
"The following items WILL be permitted inside the Circuit gates.
Blankets/Towels
Umbrellas (small, hand-held style)
Baby strollers
Portable, collapsible chairs
Personal camera equipment (e.g. digital cameras, point-and-click digital or film cameras). *There will be no lens restrictions.
Binoculars
NOTE: All bags, purses, backpacks and persons are subject to screening by security personnel. Fans entering Circuit of The Americas should prepare accordingly. Ticketholders should be aware that there are no provisions for returning banned items to them when such items are left at facility entrances. Patrons are encouraged to leave all banned items at home or in their vehicles before entering. Individuals who deliberately attempt to bring banned items through security checkpoints are subject to removal from the facility. All security measures are subject to change without notice.