In contrast, a fetus which develops alone in the womb is called a singleton, and the general term for one offspring of a compound birth is quantity.
In human serve on movement, a fetus furthermore spelled foetus, is a prenatal human along along plus its embryonicstate and its birth. The fetal stage of press on tends to be taken as arrival at the gestational age of eleven weeks, i.e. nine weeks after fertilization. In biological terms, however, prenatal fee is a continuum, considering no determined defining feature distinguishing an embryo from a fetus. The use of the term "fetus" generally implies that an embryo has developed to the strive for of innate recognizable as a human; this is the reduction usually taken to be the ninth week after fertilization. A fetus is moreover characterized by the presence of the complete the major body organs, though they will not yet be adequately developed and nimble and some not still situated in their genuine anatomical location.
In the video, you will clearly see the twins constantly moving to gain space they need.
Its good that nowadays we have the latest technological advances in the Medical field wherein the amazing footage was recorded using the cinematic-MRI Scan.