9 now and in 9 more years he will be old enough to clean his own room (hopefully, but unlikely it seems at this point!)
Right! (Said in my most sarcastic tone of voice...)
I can't say how pregnancy affects writing. I wrote a lot in my pre-teen and teen years, and then didn't write at all until after my daughter was born. Then I started again and haven't stopped (she's 17 now).
As for colic and all that jazz: my first child (a boy) was colicky a lot. I'd phone my parents up and tell them that if they didn't come and get him RIGHT NOW, they might not have a grandson in the morning. They'd take him for a car ride, and he'd be fine.
My second and third child started sleeping through the night as soon as they were born, and were both very happy babies. Maybe that's why I was able to start writing again after Ally was born.
I breastfed all of my kids for varying lengths of time, and I much preferred it to bottle feeding. Not only was it better for the kids, it made me feel good, too. However, while my eldest two were "naturals" at breast feeding, my youngest had to be taught, and there was a little bit of frustration during the first couple of weeks.
Also, I had a mother who hadn't breastfed, and when my colicky son cried all the time, she said, "Give him a bottle. He's not getting enough to eat." She was silenced at the one month mark, though -- when I brought him home from the hospital, he was 6 1/2 pounds, and at one month, he was 10 pounds. He was most certainly getting enough to eat!
So advice from the mother of two teens and a twenty-somthing: listen to your body, and do what you can without guilt-tripping yourself into an even bigger writer's block. And once the baby's born, hang in there. They do grow up, eventually. They may even start writing:
http://thestoriesofcookie.com/