Because
a) you forget yourself
b) until you have your own baby, you think you are a perfect parent and everyone else is doing something wrong
c) it wouldn't make any difference, you'll still be knackered anyway, why spend a whole pregnancy worrying about it?
d) nobody ever decided they wouldn't have a baby because the first 6 weeks is hell on earth.
top tips for new mums?
Make sure you have plenty of bread, and plenty of sandwich fillings. You can eat them cold and one handed, and it doesn't matter.
Make sure you have lots of nice soft drinks, you may not have time for a cup of tea, and why should you be stuck with water all the time?
buy some paper plates and plastic cutlery. nothing more overwhelming than having to wash stuff before you can eat when you have a possible 45 second gap to do so.
If visiters want hot drinks, phrase it like this "Oh sorry, >, you'll have to check there's some clean cups before you make drinks". This implies that a, you're not making them one, b, they need to wash up first, and c, drinks, you would like one too, thankyou!
and don't get up to find sugar, etc, shout garbled insructions until they find the bleeder themselves
You can put the baby down on the floor in a room totally alone to have a wee. He/she will not fall of the floor, it is totally safe until they are at least 8 weeks old, if you have no other children or pets.