Thanks for your prompt reply. My bb only weights at 4.5lbs at birth. He is very very under weight. So at first, we give him to drink S26 (it is believed that S26 will make more weight gain). But it's not effective to my bb. He only weights 14.5lbs now (nearly 7 months). He belongs to extra small size bb.
So I am afraid that this new milk power might not help him to gain more weight.