The Importance of Hallowe'en

[joanne0012]

No: HPFGUIDX 36256

--- In HPforGrownups at y..., heidit at n... wrote:
> It's actually 10 months to the day, and pregnancy really is a 40 week (ie 10 
month) process. If harry was born 2 weeks late, he would've been conceived on 
halloween.
> 
> Just this one, which is too *perfect* for real
> life, but might work in a story: Harry's birthday
> is July 31, which happens to be 9 calendar months
> after Halloween.

Er, October 31 to July 31 is indeed 9 months.  The way obstetricians figure that 
40-week pregnancy is from last menstrual period (LMP), go back 3 months and 
add a week (39 weeks being exactly 9 months).  So if Harry was conceived on 
Halloween his due date would have been figured out thus: Starting from October 
17 (that's assuming Lily was, um, regular), back 3 months is July 17, add a week 
is July 24. So he'd have had to be just one week late, even more plausible.