" Despite saying that very young babies are primitive, it remains vital that we touch them, hold them, respond to them. One cannot just leave a baby on its own! Interacting with the baby is essential for them, not just in that moment. The development of the baby's senses requires stimulation. Vision will not develop well in the dark. Hearing will not develop in the absence of speaking and singing to them. It definitely matters to them, they just do not know who is touching and holding them. "

― Leon Levitt , What Do I Do Now? The basics of parenting babies ... without stress