Infant baptism makes sense if you believe someone can make a faith promise for someone else. It is a proxy. The godparents speak for the child, and due to the good faith of all parties involved, it is believed that God will respond in kind and offer the child the graces that would have been bestowed, were the child able to speak for itself.
There have been times in history when marriages were done the same way. Arranged and even witnessed in proxy. Someone made the promise for someone else, and yet it was binding.
I can see both sides of the issue, that baptism is when an infant is born into the body of Christ. We don’t choose our earthly parents, and it is OK that we don’t get to choose being members of the church.
On the other hand, infant baptism smacks of superstition, that God’s salvific power is limited by whether or not someone said the right words over a baby’s head. That the ritual has the power, rather than an individual choosing to commit themselves to Christ.
It is a tough issue.
cheddar