rasanya 4@5 bln keatas, cuba consult dgn nurse yg incharge awk. sbb sstgah org xpndai kira wktu baby kick, dia pkai alat ni. tp ade jgk org yg beli tp xtau guna, tersalah dgr heartbeat baby walhal tu heartbeat dia sdiri, jd xsdar baby dh lemas dlm perut. pape hal kna trus refer kk @ nurse yg lebih tahu. maaf sis, ni pndapat sy je sis. 😁