Most young children do not like to take a bath. They will do anything to avoid a bath. For some reason, bath time is just a stressful time.
In rural Congo, bath time is stressful, too. But it is stressful for other reasons. And it is stressful for more than just the younger children.
First, the older children would have to walk and fetch the water for the bath. It could take hours to get water.
Also, the water is just air temperature. It is not heated for comfort. To heat the water, the older children would have to walk and fetch firewood.