You need to use shortcodes to have multiple WordPress embeds in a single post. See the examples below:
This won’t work:
Part 1
http:///www.youtube.com/watch?v=n7KQ4vkiNUk
Part 2
http:///www.youtube.com/watch?v=3qmtwa1yZRM
Part 3
http:///www.youtube.com/watch?v=-hidvElQ0xE
Part 4
http:///www.youtube.com/watch?v=9blgOboiGMQ
NPR’s Scott Simon: How to Tell a Story
http:///www.youtube.com/watch?v=tiX_WNdJu6w
This will work (you must use shortcodes):
Part 1
[youtubes=http://www.youtube.com/watch?v=n7KQ4vkiNUk]
Part 2
[youtubes=http://www.youtube.com/watch?v=3qmtwa1yZRM]
Part 3
[youtubes=http://www.youtube.com/watch?v=-hidvElQ0xE]
Part 4
[youtubes=http://www.youtube.com/watch?v=9blgOboiGMQ]
NPR’s Scott Simon: How to Tell a Story
[youtubes=http://www.youtube.com/watch?v=tiX_WNdJu6w]
WordPress states:
> To quickly embed a YouTube video, simply copy the video’s URL from your web browser’s address bar while viewing the video:
For more information see http:///en.support.wordpress.com/videos/youtube/
###NOTE##
To make the code compatible with this post I have changed `http://` to `http:///` in the first section and `youtube` to `youtubes` in the second section. Please change accordingly.