can someone tell me if this is just a stage?

[twogirlsmommy]

My dd is almost 9 months and in the past week she has learned how to go from her back to her belly from her belly to a sitting position.  She has also just started to crawl within a day or so.  My problem is now she is tired when it is time to put her down for nap but spends the first 20-30 minutes rolling around sitting up, standing up and so forth in the crib.  Sometimes she falls asleep by herself and other times she plays till over tired and then cries and I need to help (which is fine)  She doesn't do this when getting ready for bed though.  As is she is on a 1.5 hour nap and then like a 45 minute afternoon nap and almost 3.5-4 hours activity time with no problem.  I just don't understand the new struggle with going down for naps

[Peek-a-boo]

That's a big developmental milestone.  I'd ride it out for another week or so and see if she settles down--if so it was probably just the milestone.  If it goes on longer than that, you may need to look at adjusting her routine.