I have bought one playtex to try. Seems better than normal milk bottle (it claims to 排氣 from the bottom of the bottle but not the nipple part.
However, I worry the unsolved milk powder will block the air hose of the milk bottle, so, I shake the milk powder first in a normal milk bottle then put the milk into a playtex milk bottle to feed my baby. (That means, I have to wash 2 milk bottles each time. This is the most inconvenience point I think).
My method may be stupid, any good suggestion to me to simply this step?