When a caregiver responds appropriately to an infant, and the caregiver and the child's emotional states match?

When a caregiver responds appropriately to an infant, and the caregiver and the child's emotional states match, it is called interactional synchrony.

Interactional synchrony is synchronised behavior exchanged between a caretaker and an infant. For example, a caregiver may smile in response to an infant's laughter, and vice versa.

hello

question:

when would a new household be started?

a.when the oldest male died

b.when a man and a woman married

c.when the house could not hold everyone

d.when a child was born

answer: us d when a child was born

hope this have a great day and brainlest

answer; biological;