Hi MumofLewis,
as a nutritionist I would never recommend soy to a baby as it is a phtyo-oestogen so can mess with the bodies natural hormones - in fact studies have shown that babies given soy often enter puberty early.
I would also not recommend Lite milk as it is no easier to digest than ful fat milk and is lacking in essential fats which babies need.
Goats milk is definately the way to go - it is most similar in composition to human breast milk.