[mlyle]

> 1/2 correct - 40 weeks is 10 months from conception to birth.

Average length of pregnancy, ovulation to birth is 268 days -- 38.3 weeks or ~8.8 months.

But we typically count pregnancy from last period (this is easier), which makes it pretty close to the round 40 that's usually cited.

> 40 weeks is 10 months from conception to birth.

A month is ~4.35 (6957/1600) weeks, so 40 weeks is ~9.2 months (69400/6957).

[robocat]

Ooops, thank you heaps. Very glad to find out that 40 weeks is not a particularly correct answer either! But dividing 40 by 4 to get 10 months was a stupid mistake for me to make!