I'd ask the credo-baptist the same thing. How long must/can one wait? On what authority do you pick and choose which parts of God's command to obey? These days it's optional (or at least wait until you've completed the 'Alpha' course), since it's only a sign of an "inward cleansing"
I can only answer for one person, me.
Peter described two things to be done (repent and be baptized), made the command universal (every one of you), explained why (for the remission of sins), and promised a specific result (receive the gift of the Holy Spirit).
The only question is have you (not YOU, but anyone) done all Peter commanded, for the reason Peter commanded with the result that Peter promised?
That is not a question for me to answer for any other soul.
I believe that I have ... I repented and was baptized in the name of Jesus Christ for the remission of my sins, which were many, and I did receive the gift of the Holy Spirit. As far as I am concerned, anyone who WANTS to do the same can expect my enthusiastic cheers and support.
I have not seen a convincing argument that any baby is "repenting and being baptized for the remission of sins and shall recieve the gift of the Holy Spirit."
So I cannot stand on the side and cheer for the baptism of someone who may or may not have repented, the purpose of which baptism may or may not be the remission of sins, and who may or may not receive the gift of the Holy Spirit. Sorry, I wish I COULD offer more encouragement.
The best that I can say is "Do what you think right."
I would hope to be granted the same liberty.