“He [Jesus] came to save all through himself; all, I say, who through him are reborn in God: infants, and children, and youths, and old men. Therefore he passed through every age, becoming an infant for infants, sanctifying infants; a child for children, sanctifying those who are of that age . . . [so that] he might be the perfect teacher in all things, perfect not only in respect to the setting forth of truth, perfect also in respect to relative age” ~Irenaeus (Against Heresies 2:22:4 [A.D. 189]). 
“Baptize first the children, and if they can speak for themselves let them do so. Otherwise, let their parents or other relatives speak for them"  ~Hippolytus (The Apostolic Tradition 21:16 [A.D. 215]). 
“The custom of Mother Church in baptizing infants is certainly not to be scorned, nor is it to be regarded in any way as superfluous, nor is it to be believed that its tradition is anything except apostolic” ~Augustine (The Literal Interpretation of Genesis 10:23:39 [A.D. 408]). 

Congratulations Miriam Therese!