Crown-to-heel length5 tenths m
5.5 thousandthsFootball field lengths
6,667Human hair widths
2.3 tenthsMotorcycle lengths
Average full-term newborn
Photo on Unsplash
Newborn Baby
3.5 kg of potential with a 2 Hz heart rate/The Human Body
A full-term newborn averages about 50 cm in length and 3.5 kg in mass. Their heart beats at roughly 120-140 bpm, about twice the adult rate, and their body temperature sits just a hair above the adult norm at 37.2°C. They arrive with about 270 bones, which is 64 more than an adult has, because many fuse together during growth.
Measurements
Body mass3.5 kg
17.5Smartphones
1.75Chihuahuas
70Rubber ducks
Average full-term newborn
Heart rate2.2 Hz
4.4Grandfather clocks
1.22Walking footsteps
4Record players
About 120-140 bpm; nearly double an adult's
Body temperature310 K
5.4 hundredthsSun surfaces
1.23Antarctic penguins
1.08Hardwood floors
37.2°C; slightly above adult normal
Head circumference3.5 tenths m
97.2 trillionAlpha particles
1.8 tenthsDwayne The Rock Johnsons
1.59TV remotes
About 35 cm at birth
Blood volume270 millionths m³
9.6 thousandthsMicrowave ovens
45,000Teardrops
54Cough syrup doses
About 270 mL, roughly 80 mL per kg
Foot length7.5 hundredths m
3.1 quadrillionthsVoyager 1 distances
3.7 tenthsCorn cobs
13.9 trillionCarbon nuclei
About 7.5 cm at birth
Breathing rate6.7 tenths Hz
279 trillionthsWiFi signals
6.7 hundredthsStrobe lights
30-60 breaths per minute, averaging ~40