Breastfeeding - nothing prepared me for how difficult it would be, but we got there in the end. I just expected it to come naturally.
Getting out of the house - I used to be thrown into a spin by the prospect of visitors arriving before midday. Now having to get out of the house, toddlers and baby dressed and get to the school gate by 8.40 am puts things in perspective, but at the time I would get caught up in a cycle of feeding and nappy changes and would be incapable of leaving the house.
The fact that nothing stays the same for long. Just as you've mastered one problem/issue/crisis, things go and change and you're back to square one again. I can't believe how quickly they grow, you move onto the next stage and forget about what went before.
Reflux. When ds had this it nearly pushed me over the edge. Definite contributing factor to my pnd. So difficult to deal with when completely unprepared and knew nothing about it.
Post-pregnancy body - I couldn't believe how bad I felt, physically couldn't walk because of SPD-related stuff exacerbated during the birth. Trying to care for a newborn whilst on crutches was difficult, hobbling around for months afterwards, stitches, all the unmentionable stuff that happens after the birth, totally unprepared for it!!
Losing touch with so many friends, gradually at first but a very definite change in my priorities (and capabilities!) meant that old friendships fizzled out, some quietly, some with a bang, but lots of new friends who were a whole lot more understanding of my new life, and lots of old friends who understood perfectly!
Change in identity - from the minute I went on maternity leave I was no longer defined by my job, and from then onwards my confidence has been affected and I've struggled to come to terms with my new role. Still work, but part-time presents its own particular challenges, and the feeling every day that my brain might have turned to mush and I just deal with nappies on a 24/7 basis - whereas dh's life is relatively normal in comparison!!
The ups and downs - and the speed of them. Forget taking each day as it comes. Sometimes you have to take each hour as it comes, or even a few minutes at a time. You can have a wonderful moment where it all comes together and you feel on top of the world, or you can be standing in the centre of a 'crisis' sobbing, and half an hour later it is all forgotten about as you move onto the next thing.
I think thats about it!!