The first meaning is 'metre' which is a measurement of length. If the 'm' stands alone it is metre. The second meaning is 'milliâ¦' which means a thousandth. In this case 'm' can not stand alone, we need to know what we have a thousandth of; if it is weight, length or some other thing. Example: mg means 'milligram', a thousandth of a gram. Example: mm means 'millimetre', a thousanth of a meter.
At about six weeks into pregnancy (four weeks from conception), you should be able to see your baby's heartbeat on ultrasound. The typical heart rate at this age is about 100 beats per minute.
A fetal Doppler device uses ultrasound to map the uterus and playback representations of the fetal heart rate. Your babyâs heart will start beating around 5 or 6 weeks gestation, and it can sometimes be heard as early as 8 weeks (with ultrasound).martphones have microphones that are sensitive enough to pick up your babyâs heartbeat. You can simply download an application â such as the new Health & Parenting Tiny Beats Baby Heartbeat Monitor App â and easily monitor your babyâs heart rate from home.