My baby has been having soya milk since 6 months old as he can't digest milk properly and that he has 濕疹. My son is now 21 months and that he prefers soya milk.
Maggie01,
Don't worry. My son has also changed to soya bean milk formular since his 4 months because of 濕疹. So far so good. Don't 'look down' on your lovely twins. I believe they could adjust to the changes. keep up your spirit.