your baby may have colic (stomach got wind). I heard that baby who has colic normally cry during evening (after 4 plus) and they will curve their bodies or pull their legs towards stomach.
You can try applying Ru Yi You everytime after shower and diapering. Try massage his stomach with Ru Yi You in circular motion (two hands forming heart shape from centre). YOu can also give your baby gripe water to relieve the wind.
If you are breastfeeding, take note on the food that you consume, some food tend to cause wind, eg cabbage. You can check more about it online.
If you are bottle feeding, some types of bottle have anti-colic function. Try not to keep the milk for too long to avoid wind.
In my opinion, I dont really agree to let baby cry for too long. You baby is still young, cry too long wll induce more wind as well. Not longer than 10 mins. Carry a while is ok as they are still young. Your love can calm your baby down definitely.
Hope it helps and take good care of yourself too. Stay calm and happy