CarMan,
Actually, MCH's nurse suggests do not need to change to 轉2號MILK, but I will do so. For Wing Wing, I let him 轉2號MILK when 7 months since I gave him solid food on 6 months and I gave sometime for him to adjust for the solid food first. For Yiu Yiu, I am now still struggling. Since Yiu Yiu may not "all c c" everyday, and 2號MILK will make the cc more harder, so I think may be I will change to Japanese "snow brand" when she is 9 months old and no need to change to 3號MILK