- A baby. It's alive. How could it be?
- The blankets are made of some odd material. It must be fireproof.

14 seconds sound clip from Superman (1948) - Superman Comes To Earth (Chapter 1).

You can hear this line at 00:11:27.270 in the Blu-ray version of the episode.

Quote context

[...]

- With each hour, the intensity of the tremors increased. Krypton became unbearably hot as it was drawn closer to the sun.

- Jor-El worked incessantly to complete his tiny spaceship though he knew only one of them could go in it.

- The fatal moment had come. All Krypton shuddered as it suffered the tormenting agonies of doom.

- And as Krypton and all its people perished, the infant son of Jor-El and Lara hurtled through the infinite reaches of space toward distant Earth.

- Eban, it's landed over there behind that rock.

- A baby. It's alive. How could it be?

- The blankets are made of some odd material. It must be fireproof.

- Hey, it's a cute little tyke, isn't it?

- Ethan, this baby, the queer machine that brought it here... where did they come from?

- Out of the sky, I reckon.

- That doesn't make sense. What are we going to tell people?

- We're going to tell them nothing. Want everybody to think we've gone crazy?

- Say, we'd better get back to the house. The baby may be hungry.

[...]