Hate is a strong word, it is not frustration, irritation, anger, or annoyance, it seems as if it is so much more. It can feel as if that is all there is and this is why this emotion can feel deeply unsettling...
If we think generally about why we feel as if we may want to harm another person, it is often connected to feeling threatened. To feel such from your baby may seem perplexing, as your baby poses no threat to your physical safety, which suggests that what you feel may be a threat in some ways to yourself emotionally...