Post-nap surprise

When I went into Astrid's room today (after she woke up from her morning nap) I found her on her hands and knees in the "crawl" position. This isn't the first time I've found her in this position in the crib but it always shocks me. I'm so used to entering her room and seeing my baby lying on her back crying for mommy. But Astrid's getting more independent each day and I guess it's just a matter of time before I'll find her standing in her crib, or trying to crawl out.