Final answer:
The second 'P' in the period of purple crying stands for 'Peak of crying.' During this phase, babies may cry more intensely and for longer periods of time.
Step-by-step explanation:
The second 'P' in the period of purple crying stands for 'Peak of crying.' The period of purple crying is a normal developmental phase that newborns go through where they cry intensely and frequently, typically starting around 2 weeks of age and decreasing around 3-4 months. During the 'Peak of crying,' babies may cry more intensely and for longer periods of time.