What is your proof that evolution (a new species coming from a separate species) exists? I have seen sites promoted by the believers in 'evolution', but they always are proof of only intelligent design; that is, it's only seen in labs, but the scientist there is the intelligent designer.
Now, 'reading' the fossil record is nothing more than seeing what you want to see.
So my question: in the wild, has there ever been a proven example of a species being born that cannot mate with the generation right before it? No lab work allowed.
That would be pretty unusual, but probably happens sometimes. I would guess that the more typical situation, if you're talking about "sympatric" speciation (where the populations involved remain in contact) is that reduced fertility arises between populations within a species. IOW, if I as, say, a female, mate with a male from the other population, there is a lesser chance that I will have viable offspring than if I mate with a member of my own population. Under those circumstances there can arise a selective pressure to avoid and discourage such matings. This will further separate the populations genetically and greater of full infertility can emerge over time. Of course this can also happen if the populations are physically separated.
For some examples of observed, or recent and readily inferred, speciation, look here and here.