27/03/2013 20:52 GMT | Updated 22/05/2015 10:12 BST

Your Unborn Baby Week By Week: First Trimester Development

Looking down at your tummy and wondering what's really going on inside that teeny-tiny bump?

Here's how your unborn baby is developing from conception to the end of the first trimester at 12 weeks. Prepare to be amazed, there's a lot going on in there even though you may not be showing yet.