I did with both of mine, because I couldn't afford not to after the maternity pay went down a lot. A friend of mine seems to have forgotten I did this, and has just had her first, and is slagging off a member of her ante natal group with phrases like, "Why did she even have a child if she couldn't wait to get rid of him to a childminder?"
I love my children, I do my best for them, but both were in childcare whilst I worked full time from 10 weeks and fourteen weeks respectively.