I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
When she came at you with the knife, you were also holding your baby. The baby was as much endangered as he would have been had she fires a gun
at you while you were holding the baby.
Getting CPS involved at this point will do little but add confusion the mix, and possibly result in the baby being removed form both of you while CPS sorts this all out.
You have a good, solid basis to get a Temporary restraining order for both you and your child against your wife.
And while the fire is hot, you really need to consider filing for divorce and immediately asking for full custody of your child with, at most, supervised visitation for your wife---at least until she has received help, anger management classes and is deemed safe to be around your child by a competent psychiatrist.
So, petition the court
for a criminal
protective order for both you and your child---regardless of what the DA might seek in criminal court. Here is the packet you can use to do this in Texas: https://www.oag.state.tx.us/victims/protective.shtml
Also consider filing for a Temporary Restraining Order for you and your child, in the divorce case as soon as you get it on file. This is different from the criminal protective order.
You may reply back to me again, using the Reply to Expert link, if you have additional questions.
I wish you the best in your future,