"Mammals and birds are the highest forms of life and the most "evolved""
ERNT
Try again.
"But most of them have offspring that are born helpless and unfit to survive on their own."
Well, you can't give birth to a full-size human with a fully developed brain!
Can you?
"Every life form before mammals and birds has offspring that are essentially self-reliant and truly fit to survive."
Not really, offspring are usually pretty helpless in my experience.
"It is not possible for Darwinism to explain how life could evolve in the direction of having less and less fit babies."
It's not the babies, it's the species. Apes and humans are apparently better off spending more time carrying children around rather than being pregnant with them [Our superior intelligence certainly doesn't learn much in utero]
The parents evolved to care more, and love kinda co-evolved with all of this.
Yes, evolution can explain love.
"If Darwin were correct, each new species that evolves would have babies that are more fit."
Our babies are extremely fit.
Do you see any other babies that can fit into human society and reproduce with other humans as successfully as human babies?
Fuck no.
Plus I can do calculus.