Thanks ladies
After that post I have actually decided to wait a touch longer as Zac seems to have tummy issues. We have a lot going on and I suspected the cows milk would be fine as he doesnt seem to have a dairy allergy (trialled in the past.) However, until he is better I will leave it.
Thanks so much for the posts though, now I know its okay I am sure it will work once we get there
Thanks for the breakdown Froggymum