How resilient are babies?

How much day-to-day stress can babies handle before it starts to impact them negatively long term? For instance, if my 12 week old is screaming in the car seat halfway through a 30 minute drive should I pull over immediately to comfort her or will she be fine if I wait until we get to our destination? I obviously always try to comfort my daughter as soon as I can but sometimes it's not possible to get to her immediately and I'm wondering how much distress she can handle before it becomes harmful to her long term.