Your baby’s heartbeat is now being regulated by the brain beating at between 120-160 beats per minute – that’s about twice as fast as yours! Amazingly, your baby’s toes and fingers will form their own unique patterns this week as they develop the fingerprints that will stay with them for the rest of their lives.

By 16 weeks of pregnancy, the fetus’ heart is normally completely formed and beats at a rate of 110 to 160 beats per minute (bpm). Fetal tachyarrhythmia is generally defined as a heart rate that exceeds 180 to 200 beats per minute.

A very fast heart rate may be caused by abnormal firing of the nerves that are responsible for the heartbeat. If the heart beats too fast, contractions are shallow and not enough blood is pumped with each heartbeat. As a result, the fetus can go into heart failure.

Tachycardia is an abnormally fast heart rate. The normal fetal heart rate is between 120 and 160 beats per minute. Typically, an abnormally fast heart rate is over 200 beats per minute.

By the beginning of the ninth week of pregnancy, the normal fetal heart rate is an average of 175 bpm. At this point, it begins a rapid deceleration to the normal fetal heart rate for mid-pregnancy to about 120–180 bpm.

Normal Results For resting heart rate: Newborns 0 to 1 month old: 70 to 190 beats per minute. Infants 1 to 11 months old: 80 to 160 beats per minute. Children 1 to 2 years old: 80 to 130 beats per minute.

There’s no difference between fetal heart rates for boys and girls, but the rate does vary with the age of the fetus. By approximately the fifth week of pregnancy, the fetal heart rate is near the mother’s — around 80 to 85 BPM.

Also, remember that your child’s heart naturally beats faster than an adult heart and can get much faster during exercise than an adult heart rate.

Women’s Hearts are Different To make up for having smaller hearts, a woman’s heart rate is generally faster than a man’s. Men average at about 70 beats per minute while women average at about 78 beats per minute, causing the female heart to work harder over the course of her life-time.

Fetal bradyarrhythmia is generally defined as a sustained heart rate less than 110 beats per minute. Bradyarrhythmia can range from mild to serious, depending on gestational age, underlying cause, and each baby’s unique condition, including any associated complications.

Low fetal heart rate. In general, a low fetal heart rate is considered to be fewer than 100-120 beats per minute. This condition is also known as fetal bradycardia. In the study, the risk of miscarriage increased from 5% to 21% if both a low fetal heart rate and small crown-rump length were present.

First trimester survival rate was 61.6% among 531 embryos with slow early heart rates (< 100 bpm at < or = 6.2 weeks, < 120 bpm at 6.3 to 7.0 weeks), lower than the survival rate of 91.5% among 1501 embryos with normal heart rates (p < 10(-8), Fisher’s exact test).

Stress-related changes in a pregnant woman’s heart rate and blood pressure, along with chronic anxiety, can affect the heart rate of her developing fetus, a new study concludes.

Normal H​​eart Rate Range for Ch​ildren & Teens

Growth retardation occurs when your fetus doesn’t develop at a normal rate. It’s widely referred to as intrauterine growth restriction (IUGR). The term intrauterine growth retardation is also used. Fetuses with IUGR are much smaller than other fetuses of the same gestational age.

Causes of Fetal Growth Restriction The condition can also occur as the result of certain health problems in the mother, such as: Advanced diabetes. High blood pressure or heart disease. Infections such as rubella, cytomegalovirus, toxoplasmosis, and syphilis.