My baby just turn 6.5 months.. she just grab anything to help her to stand and she made it in few attempts. Now she is starting to move in small steps. My Friend told me that standing in such a young age can cause bow leg. Is it true?

Nonsense! Bow leg is caused by lack of calcium / vit D - usually malnutrition - not cause of standing early. Baby is human not a prop - think ur friend was thinking of a too heavy top on wooden sticks? Baby will know their limits and will be exploring to try to move and strengthen their muscles and increase their reach with such movements. Just makes sure ur home is baby proof alrdy and danger free