Carolina Wren nest

Josh, our 2-1/2 year old son pointed out that a bird was outside. He had found that a baby bird had fallen or was pushed out of it's nest. I put it back in. And then it happened again... and again. I read on the internet that you should warm the baby up so mom doesn't push it out. I called my friend Tina for advice. I didn't know what was going on. I thought maybe the nest was too small, or there was something wrong with one of the chics. It turned out that the nest was too small or the design was just too much of a slide, for I hooked up a towel underneath to support it and they are doing great.