Roman Catholic, Orthodox, Church of England believe in infant baptism, which is called a Christening. for these christians it is a ritual which allows them to receive God's blessing, and the babys parents will promise to raise the child as a Christian.
It was practiced in the first year of Christian history and there are accounts of whole families, probably with children, being baptized in the book of acts.In many denominations, this is followed with confirmation, in teens, where a public statement of their faith is made to confirm promises.
non conformist such as Baptist, Pentecostal believe in believers baptism. Emphasis is placed on the conscience decision. Believe that grace is received as the result of their expression of the faith rather than the ritual.Supported by Jesus - baptised as an adult and others in the New Testament where the belief was you needed to be a believer
Quakers and Salvation Army don't practice baptism and they feel they receive God's grace internally so no need for an outward ceremony