I've been to
Disneyland many times with an infant, so I have a little bit of experience when it comes to which ride your infant can go on.
There are a lot of rides the baby can go on with you at DL, most rides actually. The rides she can't go on are: Matterhorn, Splash Mountain, Thunder Mountain, Star Tours, Indiana Jones, and Gadget's Go Coaster.
Although the baby can go on the rest of the rides with you, some maybe a little too loud for the baby if your baby is sensitive to loud noises. And remember the little drop in Pirates of the Carribean could upset the baby a little, although it didn't bother my two babies.
In the case of DCA, it is geared toward older kids and adults, so the baby will not be able to go on very many rides at this park, but you should have not problem if you use the baby swap.
Also, if you go to any of the 3D attractions with the baby sitting in your lap, be aware that the sound track for these movies are usually very loud. I've heard many babies crying during these shows because of the noise factor.
I personally have never done the baby swap, but from what I hear, you should have no problem using the swap with a party of 4, two ride while two wait, and then swap places and the other two ride.
Hope this helps!