Thank you for your query,
Newborns will cry for the following things without any other associate symptoms.
2. Wet due to passing urine or stool
4. Nose block
Around 2 months the most common cause of crying is due tp evening colic, pain caused due to abdominal pain
You can try the following to relieve the colic pain.
1. Give colimex DF drops 15 minutes before feeding him
2. Hold the tummy of baby against the shoulder
3. Gently do massage
on baby tummy.
And the colic pain decreases as the age increase.
Hope I have answered your query.