If you have previously recommended this thread, you should see a tick / check mark on the recommend button. Click the tick to undo the recommendation (the tick may appear to change to a cross as you do this.) If you added a comment with your recommendation, you will need to delete that from your facebook wall separately.
Just wondered...there are so many new mums here. I'm 46 and my ds is 8 weeks old. Now, I'm not expecting anyone else to be as ancient, but if you're 40+ with a little one and up for a chat, I'd love to hear from you.