When we flew cross country with our baby, a mom and two older kids across the aisle insisted that we give her our baby to hold and at that point we were so frazzled from the screaming and fussing that we acquiesced and they had the baby laughing and cooing the rest of the flight. If I’m being honest I was a little bit hurt.
Babies generally respond well to new and varied stimuli. That sounds like a great recipe for a happy baby. Parents still close enough to feel safe, but new people and behaviors to experience. I've also found babies generally love kids...
