What decides where nipples are on mammals?

Why is it that some mammals with small broods have the baby feeding apparatus near the upper limbs like humans and elephants and some near the lower limbs like cows and horses? As it turns out, this is a very good question. What dictates where the teats are on a mammal? The short answer is, well, no one is really sure, but that's not going to stop us from a bit of deductive reasoning and speculation. And one man who is up to the task is Queen Mary University of London's Chris Faulkes.Chris - We've got teats in the thoracic or chest region like humans, the sort of intermediate area or abdominal... Like this podcast? Please help us by supporting the Naked Scientists