I gained 35 pounds, going from 112 (8 st) to 147 (10.5st). I had a tiny less than 6 pounds baby. I lost 9 pounds with the birth. Then over the next two weeks, I lost another 16 without in any way changing my routine, exercising, eating less - I had a c-section. I plateaued at about 3 weeks, and have not lost a single pound less, so I now weigh 122, 8st 10, at 5'2".
Here's the thing. I was warned several times about my weight gain being too much. I had very bad morning sickness, and if I wasn't eating olive oil baked breadsticks all day, or some other crispy thing, I puked or wanted to puke, and so I just gained and gained. And now I weigh 10 pounds more, my baby is 11 weeks old.
Big deal. I had a BMI of 20.85, now I have a BMI of 22.7. If I could be arsed, I could diet. By the end of summer, I'll be walking further, doing more exercise - the weather here is horrible, and I'm a bit snowed under with work and baby work and don't get out much. I expect to lose about another half stone with no effort, maybe it'll take a bit more effort to lose the last few pounds. So yes, I would agree, it shouldn't be an obsession. I've got a perfectly healthy BMI now, I look a bit chubby, but hey, I had a baby less than 3 months ago. I think it was kind of unbelievable that I was being scolded for gaining too fast.