Trying to choose between the UPPAbaby MESA and Nuna PIPA? We break down safety, fit, stroller compatibility, weight and real parent insights.

A hot car can quickly become a dangerous environment for children, even on mild or cloudy days. Temperature rises quickly inside a parked car — within 10 minutes, the inside temperature can increase by nearly 20 degrees, even with windows cracked open. This creates an extreme risk for heat stroke in children, especially since a child’s body temperature rises three to five times faster than adults.

If you’re shopping for an infant car seat, find out what our gear experts say about two of the safest, top-rated options: the Chicco KeyFit 30 vs. KeyFit 35.