Yes. The nucleus starts with a mass of 238 for uranium, the major isotope. When it decays it loses four of those. It gets rid of part of its nucleus and forms new mass weight. It now becomes something with uranium 234, with mass 234. Then it decays away, and you go down through a chain like this. At each stage the nucleus of the atom gets a bit smaller. Sometimes it becomes more stable and sometimes less stable. Eventually it gets down to a state where the nucleus has the right balance of protons and neutrons and it's stable. It no longer wants to break up. With these decay chains that is normally lead. It's occasionally bismuth, but normally it's a lead isotope.
On February 26th, 2013. See this statement in context.