The most ancient of Christian traditions answer this question. In baptism, the Holy Spirit is conferred in an invisible way. When an Apostle (and today, their successors) laid hands on someone already baptized, they were calling down the Holy Spirit in a visible and charismatic way. Thus from the beginning of Christianity, a distinction is made between baptism and the imposition of hands on a person and receiving the Holy Spirit in a more profound way. The most ancient of Christian traditions continue this practice to this day; for after a person is baptized, they are confirmed. It is thus demonstrably the regula fide of Christianity that from the beginning, there is a distinct and separate practice of baptism and confirmation.
Call it confirmation, Chrismation or whatever you want, Scripture is clear the laying on of hands is something separate and distinct from baptism. It is done post baptism. In addition to the verse referenced above from Acts, here is another verse describing it as something separate and distinct from baptism...
"Therefore let us leave the elementary teachings of Christ and go on to maturity, not laying again the foundation of repentance from acts that lead to death, and of faith in God, instruction about baptisms, the laying on of hands, the resurrection of the dead, and eternal judgment" (
Heb. 6:1–2)