What is the reason why the baby's legs are not straight?

Patient's question:

Patient Gender: Female
0 days old baby was born with legs not straight, the doctor said it was nothing, and it would be fine after three months. But now not only are the legs still not straight, they are also severely bent. The gap between the legs is 5 cm. The lower legs are outwardly rotated. What is going on? Sometimes when sleeping, the legs twitch a few times. Is it due to calcium deficiency?

Doctor's answer:

Hello
Have you ever walked too early? If not, it is necessary to check for a high possibility of causing rickets.