Which?
Apparently they use collagen, the placenta and amniotic fluid to get stem cells for anti-aging treatments. Its not the well known brands apparently, but the small niche products.
One company, Skinmedica - bio-engineers skin material from infant foreskins to be used in an anti-wrinkle cream.
A story about doctors from the Ukraine who admitted to the practice of breeding babies and then aborting them for their tissue. http://www.lifesitenews.com/news/archive/ldn/2006/mar/06032902
http://www.lifenews.com/2010/05/20/state-5108/ - Link to a study about the practice. Study is available at the end of the article.
http://www.law.uh.edu/healthlaw/perspectives/2010/%28CM%29%20Cosmetic.pdf Link talks about the use and a company called Neocutis
Also, Pepsi is using cells from aborted babies to bioengineer artificial taste receptors to test flavorings in their drinks.