Tell or Say, please, as quickly should fight serdechko at a fetus at 17 ned...

[Natasha]

Tell or Say, please, as quickly should fight serdechko at a fetus at 17 ned pregnancy?
And when the doctor in ZHK should listen to it?

[Olga]

- To mine, palpitation of a fetus gde-that 120 140 ud/minutes, that is twice more often, than at the adult person. But on such term it still can not be listened. If I am not mistaken, precisely should be listened from 22 24 weeks.