Which drug can I use for a baby of 2weeks having navel pain?
Only a pediatrician who has examined your baby is allowed to prescribe medications for the baby. You need to know exactly what before you can decide on the type of treatment and that can only be done by a professional.
There's no particular medication for colic. All you have to do is to rock your baby to calm him down. Colic normally resolve on its own after sometime, it's a phase and you shall soon by-pass it.