Whedon's version of the newborn was nonsensical: A bone white spider alien that sucked blood. It had no narrative justification and was there just to up the ante and give us a new monster. Just a big bad that looked cool.
It did have narrative justification thanks to dialogue earlier in the script. Gediman makes remarks about the queen's next breeding cycle being different. So it's setup. Which is more than can be said for the final film where the newborn is setup and introduced in the same scene with no setup prior.
I don't mind that but the rest of the discussion is cheesy when they compare them to ants and bees. So they're mutated bugs now.
The scene actually does the exact opposite.
"These things ain't ants, stupido!"
The comparison is a thin one.
Every time they try to box the alien into a definition in the first two films, the alien subverts belief.
"What do you mean they
cut the power. How could they cut the power man, they're animals!"
Think they're going to get off the planet, a lone warrior acts like a sapper and traps them. They think they have the colony secured and barricaded, the aliens find a way in. Ripley thinks she's gotten away from the queen, it takes the elevator up.
I would point out that, although later media made it clear, it was never made clear in the first film that fire was going to do anything to the Alien at all. Nothing in the film suggests that it does either. Doesn't save or help Dallas one bit in the vent.