At around age 30 when I was going through a JC for a charge of apostasy it was suggested that I was going against my childhood baptism. When I got baptised at age 12 it was after some of my peers had already been baptised and there was a congregation bus trip to Bethel that I wanted to join them on but was restricted to baptised brothers and sisters. Thus I expressed interest in getting baptised. I thought it was the right thing to do and it was done out of a certain love for God. However as an adult I saw things very differently. Yet in the eyes of those men once I had committed myself, even as a child, I was bound to it for life.
At any rate, it is wrong for JW's to be critical for denominations that practice infant baptism because the baptism of children likewise has no basis in the Scriptures. In 2006 when I was learning these thing I wrote up some questions based on my personal research.
http://www.anthonymathenia.com/bible-study/is-the-baptism-of-children-scriptural/