Can't think of a reason as to why not - as I've said in other posts, I always go along the lines of 'if it's safe for me, then it's safe for a child over 12 months old' (as long as it's not a choking hazzard)
I found this on a 'rival' board
Can I give my toddler goat's milk?
Goat’s milk is unsuitable for babies until the age of six months. It is deficient in folic acid, so a supplement would need to be given. It also contains lactose (milk sugar), so if your baby were lactose-intolerant, it would still not be suitable. Goat’s milk formula has passed all EC and World Health Organisation regulations for baby milk formula, so it is suitable from birth. The manufacturers state that it has added folic acid, but it still contains lactose, so once again is not suitable for lactose intolerance. The Department of Health guidelines state that it should only be given if clinically indicated.
HTH