Paul wrote to the Ephesians that there is “one Lord, one faith, one baptism” (Ephesian 4:5). Either sprinkling a child is correct or immersion when 8 is correct, there is no in-between. These represent two different baptisms. Infant baptism isn’t new; it was practiced in the days of Abraham (JST-Genesis 17:4-8, 1), and in the days of Mormon and Moroni (Moroni 8).
The Lord is eloquent in His indignation. First He explains why little children don’t need baptism.
“And…little children need no repentance, neither baptism. Behold baptism is unto repentance to the fulfilling the commandments unto the remission of sins.”