There are other disincentives, too, especially for pharmaceutical companies: Pregnant women are "not a huge market, and it does carry this potential risk of liability," Baylis says.

另外还有一个阻碍因素，尤其对制药公司而言：“怀孕女性不是一个很大的市场，而且还需对这种潜在风险承担责任。”Baylis说。

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She says right now there a lot of pregnant women, but they may not have planned it like she did.

她说，现在这儿有很多怀孕的妇女，不过她们不是像她那样计划的。

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The leaflet says it is not recommended for pregnant women, but the Department of Health points out that this is because they are routinely excluded from medical trials rather than because of concerns of harm.

BBC: Whooping cough vaccine a 'no-brainer' during pregnancy

The government says mercury is not a health risk, although it does advise against dental treatment in pregnant women.

BBC: Dentist