Same as bellamy’s - prone to forming clumps and instruction is also to shake. 2 options- (1) u still shake vigorously to dissolve to mix formula evenly, but need to prep milk earlier and the bubbles will eventually settle down. (2) change to another brand that does not have such issue. Nan is relatively easier to mix just by swirling
there r some FM that r really clumpy so i opt for one that isnt