At 4 months, my daughter would not bear much weight on her legs. After purchasing this product, that has all changed!!! She bounces in it all the time, plus has greater strength in her torso. She absolutely loves being in her exersaucer. It is amazing all that she has learned to do, from turning the pages of the electonic book to pulling on the toys from the bar. This is the best money I have spent on a toy for my daughter because not only has it helped her in reaching developmental milestones, but she smiles the entire time she is in it. I would highly recommend the SmartSteps Exersaucer to any parent.