I'm not ready for this

Read any parenting book and they will warn you not to overwhelm the child with too many new things. I thought this was because the child would rebel after all the change. Turns out I was wrong. As you all know, we moved Lauren to a toddler bed this past week. This transition has gone smoother than my wildest imagination could ever fathom. Even with the babysitter on Thursday, Lauren had no problems staying in the bed until morning.
Tonight brought something for which I was totally unprepared. We went shopping and thus ate dinner at a restaurant. We went to Noodles & Company because we both wanted something light and quick and it fits the bill pretty well. When Debbie started to put Lauren in the high chair, Lauren gave a fit. Knowing this is not really Lauren's M.O., Debbie came up with a reason for the fuss. Lauren decided she had no interest in using the high chair any more and wanted the booster seat. This meant Lauren was now at two major routine changes in the course of 5 days. Here's the rub: She has adjusted, once again, beautifully. I, however, was caught totally unprepared for this second change and am feeling a little overwhlemed. I can't believe she's big enough to use a booster seat at a restaurant! When the hell did this happen?
Here's what is really getting to me though. Lauren is itching to do potty training too. I have no idea how long we can hold off starting this one, but that would be three major routine changes in about 1 month. I'm convinced Lauren would have no problem starting potty training tomorrow. Daddy is a completely different story.