We should understand the mother and child as a mutually responsive dyad. They are a symbiotic unit that make each other healthier and happier in mutual responsiveness. This expands to other caregivers too. (click to read on psychologytoday.com)
When I had a puppy, he hated to be ignored or left alone. At those times he would chew up the furniture. Babies hate these things too, but they can’t damage the furniture to let us know. Instead, their development gets undermined and we and society have to live with the anxious and depressed results.