I'm in the same position you are. DD doesn't get the whole crawling thing yet, and she's not sitting on her own either. She tolerates the exersauces and the jumperoo. We just got the jumper for XMas. I do think it helps with head, leg and torso strength so I would not stop using it. Tummy time is very important, and we're doing that. I have a suggestion that I got from my sister in law. When she's on her tummy, sit behind her and let her press her feet again your upper thigh. So position yourself so that both feet can push off of your thighs. We did this a couple of times and she actually moved forward. I don't think she knew she did it, but it's a first step.