Research says tht babies put in walkers, walked at a later age, plus walkers dont really allows baby much exercise & maybe dangerous. Now, a family may find a walker helpful IF there is only 1 person at home caring for baby, allows cargiver to do other chores. But overall, it is advised not to put baby in walker for too long.
Jumpers or jumperoos .. Those types that the seat can rotate 360deg & hanging toys are excellent. Baby can reach upwards, pull, grab, jump, turn.. And safe. The muscles needed when swimming too. Actually u can do some googling on these 2 issues. Infos are easily available.