This depends on personal genes. If both your father and mother are like this, then yours is definitely not straight. Of course there are some accidents, but I feel it is still due to genes.
Some leg shapes are innate and have a certain degree of hereditary nature. Maybe some girls’ parents’ leg shapes are very straight and their acquired habits are good, so they can naturally have thin legs. The legs are straight. Another point is that if we are deficient in calcium when we are young, it will also cause the legs to not develop very well, causing the legs to be curved and unsightly. Therefore, calcium supplements should be given to the children in time after the child is born!
This situation is first related to people's usual posture habits. Nowadays, sitting still for long periods of time has become a common problem for many people. In this case, it often leads to bone dislocation and deformation. Some people don't pay attention to their walking posture when walking. Some people's feet involuntarily bend inward, resulting in X-shaped legs over time, while some people involuntarily bend their feet outwards, resulting in O-shaped legs. leg. Therefore, it is very important to maintain a correct walking posture and exercise more after sitting for a long time.
Some people’s leg shape is caused by incorrect sleeping postures when they were young. During the three years from birth to 3 years old, a baby's bones are relatively soft and highly plastic. Some babies tend to have their legs involuntarily restrained or bent in an O-shape when sleeping. If parents do not correct them in time, they will form X-shaped legs or O-shaped legs over time. Therefore, parents must pay more attention to their children's sleeping posture at ordinary times. If the above situation occurs, they must make timely corrections. You can choose to wrap your baby in a layer of cloth to adjust the shape of their legs. You can also give your baby some calcium-supplementing foods to promote the development and shaping of their bones.
Video: Why are some people’s legs straight and others’ legs bent?