When can I safely touch my Cat's week old kittens?

[FlowerPetal]

Header really says it all, Just wanted to know when I can safely touch the kittens? I read on the Whiskers web site that if I can handle the kittens as much as possible, then they may grow up to be affectionate and not shy. Theres also a large part of me that wants to start 'humanizing' if thats the correct turn of phrase, as soon as possible as I'm hoping to sell the kittens as soon as they get to 8 - 9 weeks and would like them to be used to humans by then.
Thanks in advance
Fxx

[boxtops]

If you Google "handling new kittens" several help sites come up - the general consensus seems to be between one to two weeks, as the mother cat needs to bond and will be anxious about the newborns in the first few days. She may keep moving them about to new hiding places if she sees any real or imagined threat, so if she seems worried, be guided by her. However it's been a long time since I'd anything to do with new kittens myself, so do be guided by others if they reply differently. I bet they are lovely!

[daffy654]

I have fostered many pregnant cats over the years and have always handled the kittens from day one. There has never been a problem resulting from this. In more than one instance I actually had to aid in the births.

[rowanwitch]

I handled brendas kittens from the day they were born, but she was a very laid back cat, a heighbours cat Molly had hers the same week but she wasn't letting anyone near them until they were about a week old... The same black tom was to blame we believe...