I think KH is a bit of a bitch, who in business would trample over anyone to get what she wants.
BUT saying that she shouldn't bother to have children/left them too early/is a shit parent is making exactly the sort of judgment that she herself does about mothers who stay at home!
The point is it is all about freedom of choice.
Some women are ready to go back to work when their babies are very small (I know someone who did when their baby was 4 weeks old).
Some go back after 6/9/12 months.
Some go back when their children are in pre-school or FT school.
Some stay at home.
Of course, there isn't always a choice for everyone. Many women have to go back sooner than they might want due to financial or career pressures, but just like KH shouldn't assume 3 weeks is enough time, likewise how can anyone else say that UNLESS you take a year off or whatever you're a shit parent?
As someone who has worked since DC1 was 7 months and DC2 13 months (I would have gone back after 4-6 months both times but couldn't find a job) I am less than impressed with some of the apparent judging of working mothers on this thread.