I haven't read all the other posts, but I would like to take issue with the OP's sentence: "And surely with the flexible working hours law and such a woman CAN go back to work without silly excuses."
Once and for all, lets clear this one up, based on MY experiences.
Once upon a time, I was an employee for a medium sized company. Before I had dd1 in 2004, I had a exemplary 8 year well-paid career (and one of a relatively few females) in the engineering industry.
All was hunky dory until at 8 weeks pregnant with dd1, I announced my pregnancy to a (female) line manager. To say she did not take it well was an understatement.
Anyway, when dd1 was 1 years old, I asked the company to consider flexible working. I can say with all honesty and truthfully, that at one point, I had 4 hours sleep within a 32 hour period. At another point, I worked solidly for a 2-week period including weekends, in other words, 8.50am - 7pm for 14 days on the trot. My marriage, baby and health were all suffering, sufficiently to cause my health visitor at the time "serious concern". This working pattern was no longer sustainable.
My request for flexible working was turned down, and there was NOTHING I could do about it. At that point, I felt I had no other option but to hand in my resignation.
That was 5 years ago, and after 4 years of being in non-paid employment, I am now self-employed and loving it. I dictate my own terms and conditions.
But please, please be aware of the law. You do not have the right to flexible working. You merely have the right to ask your employer to consider a flexible working arrangement. Your employer, can easily refuse it so long as he/she has a business reason to do so.
It's the words "silly excuses" that has somewhat wound me up!