Question: My baby is crying since last night, seems like he has stomach ache.
Answer: Seems your baby is gassy, you can try following these remedies-
1) Give baby lots of tummy time
2) apply hing paste around the naval
3) Do cycling excercise
4) Massage tummy in circular motion
5) Burp baby after each feed
You are offering formula milk?
If your baby is particularly gassy after using a specific brand of baby formula, then that particular brand should probably be avoided.