Like snakes, bees, lizards, crocs. Everything that doesn’t have a parent raise them. How do they “know” how to survive?
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First, if I were to cut your skull vertically and take a look at a cross-section of your brain, I’d be able to divide it into what you normally think of as the brain (the noodlely bits) and the brain-stem.
Most of your instinctual functions, such as curling away from heat, your fight or flight instincts, reflex to swallow things put in your mouth, etc. are all handled by the brain-stem.
Animals that don’t require parental nurture often have their behavior programmed into them. They’re extremely complex chemical reactions at the end of the day.
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