Final answer:
Babies find comfort and security in soft, cuddly objects, which contribute to their happiness. Research by Harlow and others has shown that maternal-infant bonding is more than just nourishment and is influenced by feelings of comfort and security.
Step-by-step explanation:
Researchers Harry Harlow, John Bowlby, and Mary Ainsworth conducted studies on attachment and happiness in babies. Harlow's experiments with monkeys showed that babies preferred the soft, cuddly cloth monkey for comfort and security, rather than the wire monkey that provided milk. This research challenged the idea that babies only become attached to those who provide nourishment. Instead, feelings of comfort and security play a crucial role in maternal-infant bonding and happiness.