When should I use the leg straps for the BABYBJÖRN Baby Carrier Miracle?

The leg straps are intended to reduce the size of the leg holes for smaller babies. The Baby Carrier Miracle leg straps should be used when your baby weighs between 3.5 kg and 4.5 kg. This may also vary somewhat depending on how much clothing your baby is wearing. Always make sure that the leg straps are not on too tightly around baby's legs.