DD1 did that. I took a cotton receiving blanket and folded it up the long way a few times and then attached it to the rail by wrapping it along the length with grosgrain ribbon I had on hand. That covered about a 24in section and did the trick. Since the ribbon was wrapped around several times down the length of the blanket and in between at least 5 or 6 crib slats it was on there very secure. It wasn't the prettiest thing but no one was going to see it but family and it didn't cost a thing.
Mom to two amazing DDs ('07 & '09) and a fur baby.
Gluten free since Nov '11 after non-celiac gluten sensitive diagnosis. Have had great improvement or total elimination of: migraines, bloating/distention, heartburn, cystic acne, canker sores, bleeding gums, eczema on elbows, dry skin and scalp, muscle cramps, PMS, hair loss, heart palpitations, fatigue. I'm amazed.