Is Infant Baptism an Ordinance of Christ or a Tradition of Man?

Although infant baptism is still a popular practise in many churches, a position has to be taken as to its Scriptural validity. Is it a valid tradition that originates from Christ himself directly or through his apostles indirectly, or is it a later tradition that originated from human invention and expediency? It is either one or the other. If you are considering this question, there are four indisputable facts, evidenced by the Scriptures, that ought to show you the right answer:

1. There is not one verse in the Bible that mentions or contains evidence of babies being baptised.  
2. The idea and practise of infant baptism was foreign to Jesus and the apostles. They did not speak about it, command it, or conceive of the idea of baptising infants.  
3. Baptism is explicitly prescribed by Jesus for those who would personally become his followers. 
4. Baptism in the New Testament happened at the time of a person's conversion, not at an earlier period before it or a later period after it. 

These Four Indisputables ought to inform the unprejudiced mind that infant baptism - no matter its ubiquity ('so many churches believe it'), not matter its antiquity ('its such an ancient practice in the church), and no matter its continuity ('its always been practiced in the church)  - is not an ordinance of Christ but a tradition of man. Given what Jesus said about the fact of human traditions replacing the Word of God (Matthew 15:1-9), Bible followers ought to be sure that this is not happening with regard to what they believe and practise about Christian Baptism.