They're born with neural hardware whose architecture has been optimized by evolution. Any choice of architecture imparts some inductive bias, making some problems easier and some problems harder to learn, and humans have the advantage that people with bad architectures (those not matching properties of the world we live in) were more likely to die or to not mate.

You're right that we don't call those inherited thought patterns memories; we call them reflexes, emotions, region-specific brain functions, etc.

This is such a wildly misleading statement that it borders on straight up incorrect.

you mean its wrong? or would that not have made you feel as clever?

Neural precursor cells literally move themselves from where they first differentiate to their final location to ensure specific neural structures and information dynamics in the developed brain. It's not declarative memory, but its a memory of the neural architecture etched out over evolutionary time.