Emily,
I'm assuming you're looking out of state as well. I'm from Minnesota - which is like Idaho in having very few young kids that are available for adoption - most are adopted by their foster parents unless they're quite severe (medical, behaviourally, etc.)
Try
www.comeunity.com/adoption/waiting/photolists.html
It's a linking website to group and individual state waiting child websites. There are others that are not well-known, in Ohio and Florida, who coincidentally also have younger kids. Ohio seems fine, but from personal experience, Florida is extremely difficult to work with. Also try
www.mareinc.org - Massachussets also has younger kids. California does too, but they're difficult to work with. I found my youngest son on
www.nwae.org which is a great group state website, and they have younger kids as well.
Good luck! PM me anytime. I'm always happy to help!!!
Sandy
__________________
Proud foster mama of many;
Proud transracial adoptive mama of:
J, age 9-1/2, and Q, age 7 (OMG!!!)
Still hoping for more kids..... 
Nellie (the cat), adopted stray
"Friends are the family you choose."