Spit up ba o Lungad?

hi momsh..my baby just turned 1month last aug 23, and mejo bothered ako sa pag spit nya ng milk..Breatfeed po sya, and once makadede sya sakin wala pang 5mins ilalabas nya yung milk na nadede nya, ( still nasa lap ko pa siya ).. pag mag bburp naman sya may kasamang lungad..what to do po? thanks in advance #advicepls