My daughter never took to the Japanese brands, either. What finally worked for us was Gerber Good Start, which a lot of moms in the US said their babies liked as well. (I just went online and did some searches and discovered this). I found they sell it at Three Sixty, not sure where else. The can is a lot smaller than other brands, which means it's also a bit on the expensive side, but just my personal experience. If your baby likes Good Start, apparently Nan Ha 1 is the name of the European version, which tastes slightly different but is available in HK in larger and less expensive cans. If that doesn't work, you can just mix it into your older child's formula until the can is used up, since I'm sure your older child is less picky, and that way it won't get wasted.