Technically they did not encourage child baptism. The article was how to make sure you are ready to be baptized. There was some advice mentioned on how to make sure the child is ready.
But what they failed to show is the examples they gave were not for children they were for youth. This group if for 15 -25 year old.
Unfortunately for every single JW family with children this article was playing on driving the children to ask the questions and think they are ready.
Although they mention it was a really important decision, one fact they forgot to mention if you take the decision to get baptized and later sin there is no way back. Like taking the red pill.