If you plan on introducing your child to products made from mammal milk that is not human, a cultured whole milk, organic product is the best choice. I personally do not agree with ingesting another mammal's milk after finding out what the dairy farms are really about (taking babies from their mothers on the first day of birth, which is so the opposite of AP I cannot support the dairy trade again). Milk from other mammals causes many health problems (incidence of osteoporosis is actually higher in women that consume a lot of milk
http://www.milksucks.com/osteo.asp )which are well documented, yet hidden by the powerful dairy council and USDA. Also keep in mind that giving a baby food or cow's milk is the beginning of the weaning process and will also change the gut flora. Human milk is the only milk a human ever needs. I was unaware of these facts when dd1 was small. She began to eat solids around 10 mo. I did give her Yobaby. She also liked kefir when she was 3 yo to 6 yo. Now we use probiotics to give us the 'good' bacteria that is hard to come by in this society's way of life and eating.
and to pp, heating a yogurt would kill the good bacteria. babies do not need anything warmed for them, they will eat their food straight from a jar (if you use jarred foods) In fact, dd1 drank my pumped milk cold, in a glass, from a very young age (when I worked on call when she was 6 mo and her father was a sahd)- she refused it any other way.