how to calm down baby when they cry out loud?

My LO cried every night the first month too. We suspect its colic (my mum told me to tap on his tummy gently; if theres this hollow drum sound = gas in stomach). And doctor prescribed Ridwind. We gave him whenever necessary. And sometimes he only feel better after vomiting (like merlion). The first few vomits were scary. But just tell yourself and your LO that everything will be fine if he vomits it out.