[Kiwami]

Blazar didn't take interest in babies, the baby was simply on the screen as Blazar took over to communicate (?) with Gento, and it seems they "discussed" the recent events of Blazar taking over. The baby on the TV screen was foreshadowing to what the episode was about.

And the left side thing I don't buy, I don't think it's that simple. Last time when Blazar made themselves known and grabbed the drink they used Gento's right arm, not the left. Also, if the left side in this scenario is Blazar, as in Blazar always represents the left side of the body, whoever made that picture conveniently forgot it was the left side that summoned the spear in the first place before passing it to the right.

This makes no sense if it is Blazar in control of the left side who would want to protect the baby in the first place. They wouldn't bring the spear out. It only works if Gento is the one who does it, intend on doing the "right thing" only to pass it to the right side, Blazar, because he himself can't finish the job, but then remembers the words of his son and decides against it in the last moment and intervenes.

To put it more simply: If Blazar's body was really split like this, then the conflict wouldn't have started this late with Gento in the driver seat all along. Because Blazar has no motive to intervene this late, he has a clear goal. It's Gento who learned from his son and had a change of heart and wants to protect the two Kaiju now that Blazar is about to deliver the final blow.