You can talk about the development of the baby in the womb and how they grow from a tiny egg to have arms, hands, fingers etc. Not providing some kind of answer for a child can result in them using their imagination to fill in the gaps, so it is better if you avoid that!
It may also be helpful to let them take the book and re-read it themselves, that helps if they have any feelings of embarrassment while reading it with you and also gives them the chance to go over any areas that they need to understand better.
Make sure you can talk to your child about how a girl’s menstrual cycle works, the fallopian tubes, the womb, ovulation and so forth.
Ensure that you also inform your child about boys and what an erection is, why it occurs, the penis, testicles, sperm, semen, wet dreams and ejaculation.
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