It’s amazing to me how children grasp the concept of time. They start out ignoring any and all attempts to schedule—2 PM sounds just as good as 4 AM. Slowly they begin to understand that dark means sleep and light means awake and it rockets from there.
Rachel understands that she once was littler than she is now and also knows that she’s getting bigger every day. This enables her to talk about both the past and the future in addition to the present.
“After I was a baby…” (alternatively “After when I was a baby…”) is often followed up with “I wored that shirt” or “I played with that toy” or “I spitted up on Mommy, too.”