Mexico road trip with kids: car seats, rules, stops

Yes. The General Law on Mobility and Road Safety, published in 2022, requires every traffic regulation in the country to include, at a minimum, that any child under 12, or anyone whose build requires it, rides in the back in a child restraint system that meets the applicable standard (art. 49, section VI), and that all passengers wear a seat belt (section IV). It is a general law: states and municipalities decide how it is enforced, so the wording and the fine change from one to the next.

Mexico City's Traffic Regulation (art. 39, last amended 10 October 2025) is one of the most detailed. Children under 12 or shorter than 1.45 m sit in a rear seat with a three-point belt, in a certified, properly anchored car seat or booster. The fine is 5, 7 or 10 UMA (Mexico's fine unit), plus one point on the license and one on the plate. With the 2026 UMA (117.31 pesos a day, in force since 1 February) that is 586.55, 821.17 or 1,173.10 pesos.

In Oaxaca, the state Traffic and Roads Law (art. 38, last amendment published on 7 October 2023) requires seat belts for driver and passengers, and that babies and children ride «only in the rear seats or» in a child restraint system. It is looser than the general law, but the general law sets the floor for every regulation. The safe way to comply in any state: under 12, in the back and in their own seat.

The one that matches their weight and height, not just their age. The child seat guide from the Technical Secretariat of Mexico's National Council for Accident Prevention (Health Ministry, 2021) recommends seats with international certification, especially UN ECE R129 or i-Size, and a car with ISOFIX anchors. For the youngest, rear-facing is the safest position, and the middle rear seat is the least affected by side impacts. These are the groups that guide uses:

It depends on who rents it. On KORU, no provider offers car seats or boosters today: bring your own. Before you set off, check that the car has ISOFIX anchors or a three-point belt in the rear seat where it will go, and practise installing it at home. In Puerto Escondido the listed fleet includes vans and 4x4s; the team confirms how many seats each model has.

A stop every two hours, or sooner with children. We found no official Mexican figure; Spain's traffic authority (DGT) recommends a break every two hours or 200 km, and shortening that interval when travelling with children or at night. With young kids it makes sense to plan the day around daylight, not distance: leave after breakfast and arrive before dark. On the Oaxaca coast, that also keeps you off the highway at night.

Start with what needs no medicine. According to the CDC Yellow Book 2026, children under 2 rarely get motion sick, and it is most common between ages 7 and 12. Looking at the horizon, not reading or using screens, and letting in fresh air all help. Medicines only on your pediatrician's advice: the CDC says to avoid scopolamine in children and warns that over-sedating with antihistamines can be dangerous. On winding roads, like the old road from Oaxaca City to the coast, the new highway is easier on everyone.

Short legs, on good roads, arriving in daylight. From Puerto Escondido, the Manialtepec lagoon is about 15 km away, and Mazunte about 67 km along Highway 200, roughly 1 h 15 min. From Oaxaca City to Puerto Escondido, the Barranca Larga–Ventanilla highway does the trip in about 2.5 hours, versus about 6.5 on the old road, according to Capufe. Chacahua, 2 to 3 hours each way, works best with a night in between.

If you are heading to Puerto Escondido with kids, go to korurent.com, search for Puerto Escondido and enter your dates: you'll see which cars, vans and 4x4s are available and the total before you pay. No KORU provider offers car seats today: bring your own and ask the team how many seats the model has.