Hypnobirthing and hypnobabies are two distinct methods. Both are based on midwifery hypnosis, but there are differences. As for choosing between home courses and real classes. I admit that I might be a little addicted because I am very shy and prefer to be at home with my family.
That is why I will always choose a hypnobirthing home study course where I don't have to go out and be forced into the classroom. However, classroom situations can have several advantages.
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If you enjoy meeting new people, this might be a good idea. You can also meet some mothers who might become friends – and your baby will get bigger and bigger.
Some women also really like the motivation of their teachers. If you're more motivated by a teacher than self-study, then taking a class can be a good idea.
You can also ask your teacher questions. While this isn't a big deal with Hypnobabies, the Home Study course has a very, very active email list and the Hypnobabies authors are very active. If you have any questions, you'll get quick and helpful answers.
My perspective, based entirely on my personal preference, is that a home study course, where you can go at your own pace and in the comfort and privacy of your own home, is the way to go. Weigh the options and decide what is best for you!