All babies cry. Crying is a means of fast-tracking the parent (or primary carer) to respond to the baby’s hunger or comfort needs, or to sensations that are too intense or overwhelming. However, recognising the different types of cry and reading the baby’s baby signals, gives parents a better chance of working out the source of distress.
Very young babies make sounds based on reflexes such as sucking and yawning. The different pitches, patterns, and loudness of the cry indicate the urgency of the baby's need. Babies also use body language to communicate with the people closest to them. As they grow older, they may use gestures such as pointing, and make specific babbling noises to get their wants and needs met.
For the full article click follow this link: Why do Babies Cry.pdf
By Dr Lin Day (founder of Baby Sensory, Hello Baby, and Toddler Sense)