My son is 19 months old .... but he always cry at night suddenly ... i checked his diaper its not so wet ... i feed him at night too ... still he cries ... don't know why

Hello Sweta, It may be colic. Babies often have pain in their stomach because of colic, that is gas. Try giving him gripe water or anything that your doctor prescribes for it. You can also put a paste of asafoetida on his navel, it also relieves colic. All you have to do it put asafoetida in a bowl and add a little warm water to it so that it melts and make a paste of it and apply it every day after bathing.