My bb is abt 6.5mo but she can't sit up by herself yet...is tis ok? Any adv to stimulate her in doing so? She seems to prefer standing more tho>< THX!

Don't worry, baby can sit on her own by 10 months without support. You can help by training them to sit in highchair 1st. Ikea high chair is good to train there, the height with table and support is good, if too much space, put a pillow behind to give her more support to prevent her slide down.