the question of 轉奶粉 is very difficult to say... like my relative who has delivered her baby 6 days later than me... she originally chose NAN for her baby but she found (I don't know whether is the real problem) that her baby didn't have a good weight gain... then she changed the formula to S26 like mine...and now her baby has a good weight gain this month...
but so far her baby is okay wohhh (like ngng...)
acutally I think if your baby weight gain is okay... you can see the chart inside your baby's blue health record book... no need to change the formula laaa...as AJ and I both find that S26 is much expensive than others...