So yesterday Ella turns to me during her speech therapy and said (in her hard to understand articulation), "Griffin's a baby. I'm not your baby, mama. I'm a big girl!"
I guess that settles it then, I no longer have 2 babies. Rather, I have one baby, and one big girl.
I still tell her that she will always be mommy's baby, and that I will always love her. Ella just looks at me sideways and grins, so I think the message is getting through to my big girl.