May we have our baby dedicated instead of baptized?
No. The theological understandings of the two services are very different. Dedication is a human act - something we pledge or give to God. Baptism is a divine act, a pledge and gift God gives to us. Baptism of infants includes the reaffirmation of the vows of the baptismal covenant by parents, sponsors, and the congregation; but chiefly it celebrates what God is doing and will do in the life of the infant.
Learn more about baptism: