✔ 最佳答案
Obviously you have no idea what it means to have children. The first thing that goes out of the window is timing!
To answer your questions :-
Statistically, you have a 20% chance of getting pregnant if you have sex at the right time (your ovulation). Most women take upto 6 months to conceive.
Once you know your ovulation date or conception date, you can work out your due date. This is 40 weeks from your first day of your last menstrual cycle.
Then babies chose their time. Babies tend to be born anytime between 37 - 42 weeks. The birth date is selected by the baby!
First babies are frequently a couple of weeks late and rarely on time.
I believe statistically less than 10% of babies are born on their due date.
Travelling is not recommended in the first and last trimester.
Last but not least are you sure you want a Christmas baby. My son was due 5th January and was born on the 18th January. He now gets all his presents in one go (often shared - ie one for Christmas and Birthday). He also does not get to look forward to something mid-year.
Think about it.
The best piece of advice I can give you as a mother... is BE FLEXIBLE!