And I have one more thing to say about babies.
I feel like the cradle argument is now sort of a distraction from a more important issue. But since you brought it up, I will summarize my current view on that too.
The concept of the argument appears to be fine. I'm a bit hesitant to fully endorse it, because someone hearing the argument might make some inferences that I would not approve of.
The issue to me is WHY are we looking at babies? If the answer is because they're a simple, easy-to-understand, real-life example that we can extrapolate to more advanced humans, then that is perfectly fine.
If the answer starts hinting at purity, uncorruption, unbias, superiority, etc. In other words, if they are held up as an IDEAL, then that is a problem. I see this as another example of idealism being snuck in via the back door.