Dear moms, we're 7 months pregnant and our daughter still can't sit…

Dear moms, we're 7 months pregnant and our daughter still can't sit independently, but she wants to stand! She doesn't even want to sit down at all! Grandmothers say to put her on a rocking chair, like they all grew up and it's normal. I read quite a few articles that supposedly rocking chairs are harmful! Share your opinion, how did your kids start walking? Was there anything similar to what we have? ?