A client, at 6 weeks gestation, arrives at the OB clinic for her initial visit and requests to hear the fetal heartbeat.What should the nurse include in the teaching regarding cardiac development?

The fetal heartbeat can be heard via Doppler by 4 weeks of pregnancy.

The fetal heartbeat can be heard by external Doppler around 10-12 weeks of pregnancy.

You will first feel your baby move in week 24 of pregnancy.

The heart formation begins in week 5 of pregnancy and we can hear it by Doppler at 6 weeks.