It is entirely normal for infants to cry without any apparent reason, and most healthy infants go through this phase.
The “Period of PURPLE Crying” was developed by the National Center on Shaken Baby Syndrome for the purpose of educating parents about the normalcy of infant crying and the dangers of shaking an infant.
PURPLE is an acronym for:
P
Peak of crying
The worst crying tends to occur around two months of age and declines from three to five months.
U
Unexpected
The crying often comes on and stops for no apparent reason.
R
Resists soothing
The baby is often difficult to soothe.
P
Pain-like face
The baby may appear to be in pain even if they are not.
L
Long-lasting
The crying may go on for several hours a day.
E
Evening
The baby often cries more in the late afternoon or evening