i have the same case with my son. 12 mos old not sitting on his own, not crawling or standing. but he does roll very well. may i know what happened and how is your baby now since 2007?
Just a quick note to say hi!
I have a ten month old who had problems with reflux. She is behind in terms of physical development. One of the ocupational therapists that she saw suggested keeping her on a prescription medicine for the reflux. She also suggested keeping her on that medicine up until she was a month past walking. The pain and discomfort make it very difficult for babies to crawl and make the progress needed towards walking. This advice helped my daughter tremendously. I would take your child into see her doctor. I hope things get easier. I've been right where you sre now. Good luck!