Recommended use: Stage 1 with built-in harness: From birth until the child can sit upright or can climb out unassisted. Discontinue stage one use when infant can sit upright, push up on hands and knees or climb out unassisted (age around 5 months) and is unable to walk. Never leave child unattended in this product. This product is not intended for prolonged periods of sleeping. Always use the restraint. Stage 2 without built-in harness: For use as a chair when the child is able to walk. Discontinue stage two use when child reaches 130 lbs.