Muslims do not believe in the concept of original sin. Muslims don’t believe that a baby who has never done anything bad in their life is born with sins. And even if a baby/kid did do something bad, it wouldn’t count as a sin since they haven’t reached an age of maturity yet. Muslims believe that everyone is born sinless, but without a doubt, each human will make mistakes as they grow older. This is why the Prophet Muhammad PBUH said, “Every son of Adam commits sin, and the best of those who commit sin are those who repent” (Sunan Ibn Majah 4251).
And Allah knows best.