If you have bought a jumper for your baby, just return it! They affect all sorts of mechanics in the body and every medical professional that deals with movement and child development would ask you to stay away from them. Inflexible ankles, permanent effects to walking gait and leg strength are just some of the side effects. These shouldn’t be sold, but companies will sell you anything that makes them money. Just google it! Try to find any resource that would recommend putting your baby in a jumper. There are zero.