From 2nd month, my boy started crying badly from 2-6am. He'd cry even after a breastfeed and diaper chsnge. Hubby and I took turns to soothe him. He was a very gassy and fussy baby.
Ways that helped:
- tummy massage helped him to pass gas (baby's tummy's right to left, up to down, then lift knees towards chest)
- carry him tummy down and "fly" him like
- white noise: hairdryer noise helps him stop crying at times, then switch to softer white noise such as rainfall sound (CD track looped through sleeping time)
After he outgrew the gassiness, he stopped wailing at night.