The 2-in-1 walkers are designed for infants between 9 and 18 months of age. We can add weight to the baby walkers by filling the tank and hollow hind legs with some water, sand, or other heavy objects, the rear wheel can be adjusted to the appropriate speed to meet the different stages of the baby's walking needs. The activity table requires 3 AA batteries (not included). For toddlers, this is a great gift for Christmas, Thanksgiving, and birthdays.