The book Babyhood, by Penelope Leach, states: “Many studies have been made of the sights which interest an infant most, the sounds which attract and hold his attention, the sensations he most clearly seeks to repeat.
તે લોકોના ચહેરા જુએ છે, અવાજો સાંભળે છે, અડકીને મહેસૂસ કરે છે.