I would argue otherwise. I would say that Christian Baptism was instituted when Christ was baptized. Jesus' disciples also baptized people John 4:2
Not so. Jesus prophesied concerning when Christian Baptism would officially begin and afterward spread to all nations:
"And said unto them, Thus it is written, and thus it behooved Christ to suffer, and to rise from the dead the third day:
And that repentance and remission of sins should be preached in his name
(water baptism) among all nations, beginning at Jerusalem." Luke 24:47
Scripture reveals this occurred in Jerusalem on the Day of Pentecost. Peter gave the command to repent and be baptized in the name of Jesus for remission of sin (water baptism) and receive the Holy Ghost. Everyone who believed and obeyed were added to the body of Christ.
"Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.
And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation.
Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls.
And they continued stedfastly in the apostles' doctrine..." Acts 2:38-42
Afterward the same command was given to individuals in various nations, and continues even unto today... (Acts 8:12-18, 9:17-18, 10:43-48, 19:1-7, 22:16)