The Period of Purple Crying:
P	peak pattern (crying peaks around 2 months, then decreases)
U	unpredictable (crying for long periods can come and go for no reason)
R	resistant to soothing (the baby may keep crying for long periods)
P	pain-like look on face
L	long bouts of crying  (crying can go on for hours)
E	evening crying (baby cries more in the afternoon and evening)