V.,
Please don't let anyone tell you that you will harm your baby by switching to formula after six months. My cousin is a pediatric doc who spent several years working at the National Institutes of Health reviewing scientific research. (I have a research background myself, though not in the medical field, and know that one can design/interpret a study to say almost anything. It takes a serious statistical background sometimes to spot the flaws in how studies are conducted and analyzed.) When my cousin was pregnant, she looked at the actual studies about breast feeding (not someone else's write-up about the studies, which can be distorted to support particular views). She looked at all the research and found that the great majority of health benefits associated with breast feeding come in the first week in the colostrum. Almost all health benefits (percent in the high 90s) have been passed on after five weeks. I still chose to breastfeed for longer than that (four months), but that was simply a personal choice. After looking at the actual research studies -- their design, analytical methods, and results -- my cousin actually decided not to breastfeed at all. She is an amazing mom, and never would do anything that she thought would harm her kids. So, unless someone has a strong background in statistics and study design, don't let anyone or any website tell you that you are harming your child, especially after six months of breastfeeding. FWIW, when we switched to formula, we had to use Alimentum because our son had a sensitive gut -- we actually stopped with breast milk on our son's pediatric GI's orders because he was having a hard time breaking down the proteins. I do not recall if Alimentum has DHA.