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!

Here's a useful article on sitting up: http://www.whattoexpect.com/first-year/sit-up/ It was mentioned in the article that usually, by 6 months old, a baby would have developed the neck, upper body and back muscles required for sitting up without support. That being said, it is not uncommon for some babies to pick up the ability to sit at around 9 months of age. You can try encouraging your baby by propping her up into a seated position in an a stroller and bringing her for a walk. Point out things that are interesting that she can now see from her seated position. The article also suggested having lots of practice and using toys to help. Have a read at the article. Hope it helps! :)