KUKU DUCK three will use bei belt  

- three kind oves different usages, cooperate with baby's different phase. 
- fitting be used for at the beginning of generate to 15kg under. 
- there is breadthways hug, vertical hug and hou bei. 
- as ventilate materiel, cooperate with accurate human body's work learn layout. 
- design accord with baby each's phase's different need.