I think the pregnancy stuff is just fine.
I don't like it when they start talking about anal sex, felatio and cunillingus.
I think that is extremely inapropriate in a family setting.
The first time I heard those words was at an assembly when I was about 8 years old. Such a strange hush went over the crowd that I knew they were talking about something very important and so I listened carefully. I even took notes so that I could look those words up when I got home.
Really, the GB has no common sense whatsoever. They ridicule other churches for having "sunday schools" that are age appropriate for their kids. The GB actually think that exposing kids to genocide, beheadings, being mauled to death by a bear, infanticide, detailed sexual activities, denigration of women, stories about how maybe god will tell your dad to "sacrifice" you, detailed instructions promoting slavery, and the mass destruction of the bulk of humanity is a good thing.
So yeah, pregnancy and birth are non issues with me and I have no problems with my kids being exposed to it.