To Paraoh’s great disappointment, his evil plan backfired.
As you recall, Paraoh’s devious plan was, “We will work them harder and even harder until they will become… COMPLETELY ENSLAVED! They will be so miserable and exhausted they’ll hardly have enough strength to hold up their heads, let alone have children!”
But HaShem thought otherwise and said, “As much as you would afflict them, so will they multiply and so will they gain strength.”
Of course, HaShem’s decision prevailed – the oppressed, miserable, overworked Jewish slaves continued to have even more and more children!